Merge pull request #3481 from github/backport-v3.32.3-9e907b5e6

Merge releases/v4 into releases/v3
Rebuild
2026-10-17 08:11:24 +00:00 · 2026-02-13 12:21:24 +00:00 · 2026-02-13 12:01:04 +00:00 · 2026-02-13 11:55:54 +00:00 · 2026-02-13 11:55:52 +00:00 · 2026-02-13 11:55:52 +00:00
40 changed files with 184839 additions and 98762 deletions
--- a/.github/actions/check-sarif/action.yml
+++ b/.github/actions/check-sarif/action.yml
@@ -16,5 +16,5 @@ inputs:
      Comma separated list of query ids that should NOT be included in this SARIF file.

 runs:
-  using: node24
+  using: node20
  main: index.js
--- a/.github/actions/verify-debug-artifact-scan-completed/action.yml
+++ b/.github/actions/verify-debug-artifact-scan-completed/action.yml
@@ -1,6 +1,6 @@
 name: Verify that the best-effort debug artifact scan completed
 description: Verifies that the best-effort debug artifact scan completed successfully during tests
 runs:
-  using: node24
+  using: node20
  main: index.js
  post: post.js
--- a/.github/workflows/__rubocop-multi-language.yml
+++ b/.github/workflows/__rubocop-multi-language.yml
@@ -56,7 +56,7 @@ jobs:
          use-all-platform-bundle: 'false'
          setup-kotlin: 'true'
      - name: Set up Ruby
-        uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1.286.0
+        uses: ruby/setup-ruby@09a7688d3b55cf0e976497ff046b70949eeaccfd # v1.288.0
        with:
          ruby-version: 2.6
      - name: Install Code Scanning integration
--- a/.github/workflows/rebuild.yml
+++ b/.github/workflows/rebuild.yml
@@ -111,7 +111,7 @@ jobs:
            # Otherwise, just commit the changes.
            if git rev-parse --verify MERGE_HEAD >/dev/null 2>&1; then
              echo "In progress merge detected, finishing it up."
-              git merge --continue
+              git merge --continue --no-edit
            else
              echo "No in-progress merge detected, committing changes."
              git commit -m "Rebuild"
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,84 +2,88 @@

 See the [releases page](https://github.com/github/codeql-action/releases) for the relevant changes to the CodeQL CLI and language packs.

-## [UNRELEASED]
+## 3.32.3 - 13 Feb 2026

-No user facing changes.
+- Added experimental support for testing connections to [private package registries](https://docs.github.com/en/code-security/how-tos/secure-at-scale/configure-organization-security/manage-usage-and-access/giving-org-access-private-registries). This feature is not currently enabled for any analysis. In the future, it may be enabled by default for Default Setup. [#3466](https://github.com/github/codeql-action/pull/3466)

-## 4.32.1 - 02 Feb 2026
+## 3.32.2 - 05 Feb 2026
+
+- Update default CodeQL bundle version to [2.24.1](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.24.1). [#3460](https://github.com/github/codeql-action/pull/3460)
+
+## 3.32.1 - 02 Feb 2026

 - A warning is now shown in Default Setup workflow logs if a [private package registry is configured](https://docs.github.com/en/code-security/how-tos/secure-at-scale/configure-organization-security/manage-usage-and-access/giving-org-access-private-registries) using a GitHub Personal Access Token (PAT), but no username is configured. [#3422](https://github.com/github/codeql-action/pull/3422)
 - Fixed a bug which caused the CodeQL Action to fail when repository properties cannot successfully be retrieved. [#3421](https://github.com/github/codeql-action/pull/3421)

-## 4.32.0 - 26 Jan 2026
+## 3.32.0 - 26 Jan 2026

 - Update default CodeQL bundle version to [2.24.0](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.24.0). [#3425](https://github.com/github/codeql-action/pull/3425)

-## 4.31.11 - 23 Jan 2026
+## 3.31.11 - 23 Jan 2026

 - When running a Default Setup workflow with [Actions debugging enabled](https://docs.github.com/en/actions/how-tos/monitor-workflows/enable-debug-logging), the CodeQL Action will now use more unique names when uploading logs from the Dependabot authentication proxy as workflow artifacts. This ensures that the artifact names do not clash between multiple jobs in a build matrix. [#3409](https://github.com/github/codeql-action/pull/3409)
 - Improved error handling throughout the CodeQL Action. [#3415](https://github.com/github/codeql-action/pull/3415)
 - Added experimental support for automatically excluding [generated files](https://docs.github.com/en/repositories/working-with-files/managing-files/customizing-how-changed-files-appear-on-github) from the analysis. This feature is not currently enabled for any analysis. In the future, it may be enabled by default for some GitHub-managed analyses. [#3318](https://github.com/github/codeql-action/pull/3318)
 - The changelog extracts that are included with releases of the CodeQL Action are now shorter to avoid duplicated information from appearing in Dependabot PRs. [#3403](https://github.com/github/codeql-action/pull/3403)

-## 4.31.10 - 12 Jan 2026
+## 3.31.10 - 12 Jan 2026

 - Update default CodeQL bundle version to 2.23.9. [#3393](https://github.com/github/codeql-action/pull/3393)

-## 4.31.9 - 16 Dec 2025
+## 3.31.9 - 16 Dec 2025

 No user facing changes.

-## 4.31.8 - 11 Dec 2025
+## 3.31.8 - 11 Dec 2025

 - Update default CodeQL bundle version to 2.23.8. [#3354](https://github.com/github/codeql-action/pull/3354)

-## 4.31.7 - 05 Dec 2025
+## 3.31.7 - 05 Dec 2025

 - Update default CodeQL bundle version to 2.23.7. [#3343](https://github.com/github/codeql-action/pull/3343)

-## 4.31.6 - 01 Dec 2025
+## 3.31.6 - 01 Dec 2025

 No user facing changes.

-## 4.31.5 - 24 Nov 2025
+## 3.31.5 - 24 Nov 2025

 - Update default CodeQL bundle version to 2.23.6. [#3321](https://github.com/github/codeql-action/pull/3321)

-## 4.31.4 - 18 Nov 2025
+## 3.31.4 - 18 Nov 2025

 No user facing changes.

-## 4.31.3 - 13 Nov 2025
+## 3.31.3 - 13 Nov 2025

 - CodeQL Action v3 will be deprecated in December 2026.  The Action now logs a warning for customers who are running v3 but could be running v4. For more information, see [Upcoming deprecation of CodeQL Action v3](https://github.blog/changelog/2025-10-28-upcoming-deprecation-of-codeql-action-v3/).
 - Update default CodeQL bundle version to 2.23.5. [#3288](https://github.com/github/codeql-action/pull/3288)

-## 4.31.2 - 30 Oct 2025
+## 3.31.2 - 30 Oct 2025

 No user facing changes.

-## 4.31.1 - 30 Oct 2025
+## 3.31.1 - 30 Oct 2025

 - The `add-snippets` input has been removed from the `analyze` action. This input has been deprecated since CodeQL Action 3.26.4 in August 2024 when this removal was announced.

-## 4.31.0 - 24 Oct 2025
+## 3.31.0 - 24 Oct 2025

 - Bump minimum CodeQL bundle version to 2.17.6. [#3223](https://github.com/github/codeql-action/pull/3223)
 - When SARIF files are uploaded by the `analyze` or `upload-sarif` actions, the CodeQL Action automatically performs post-processing steps to prepare the data for the upload. Previously, these post-processing steps were only performed before an upload took place. We are now changing this so that the post-processing steps will always be performed, even when the SARIF files are not uploaded. This does not change anything for the `upload-sarif` action. For `analyze`, this may affect Advanced Setup for CodeQL users who specify a value other than `always` for the `upload` input. [#3222](https://github.com/github/codeql-action/pull/3222)

-## 4.30.9 - 17 Oct 2025
+## 3.30.9 - 17 Oct 2025

 - Update default CodeQL bundle version to 2.23.3. [#3205](https://github.com/github/codeql-action/pull/3205)
 - Experimental: A new `setup-codeql` action has been added which is similar to `init`, except it only installs the CodeQL CLI and does not initialize a database. Do not use this in production as it is part of an internal experiment and subject to change at any time. [#3204](https://github.com/github/codeql-action/pull/3204)

-## 4.30.8 - 10 Oct 2025
+## 3.30.8 - 10 Oct 2025

 No user facing changes.

-## 4.30.7 - 06 Oct 2025
+## 3.30.7 - 06 Oct 2025

- [v4+ only] The CodeQL Action now runs on Node.js v24. [#3169](https://github.com/github/codeql-action/pull/3169)
+No user facing changes.

 ## 3.30.6 - 02 Oct 2025

@@ -315,17 +319,13 @@ No user facing changes.
 ## 3.26.12 - 07 Oct 2024

 - _Upcoming breaking change_: Add a deprecation warning for customers using CodeQL version 2.14.5 and earlier. These versions of CodeQL were discontinued on 24 September 2024 alongside GitHub Enterprise Server 3.10, and will be unsupported by CodeQL Action versions 3.27.0 and later and versions 2.27.0 and later. [#2520](https://github.com/github/codeql-action/pull/2520)
-
  - If you are using one of these versions, please update to CodeQL CLI version 2.14.6 or later. For instance, if you have specified a custom version of the CLI using the 'tools' input to the 'init' Action, you can remove this input to use the default version.
-
  - Alternatively, if you want to continue using a version of the CodeQL CLI between 2.13.5 and 2.14.5, you can replace `github/codeql-action/*@v3` by `github/codeql-action/*@v3.26.11` and `github/codeql-action/*@v2` by `github/codeql-action/*@v2.26.11` in your code scanning workflow to ensure you continue using this version of the CodeQL Action.

 ## 3.26.11 - 03 Oct 2024

 - _Upcoming breaking change_: Add support for using `actions/download-artifact@v4` to programmatically consume CodeQL Action debug artifacts.
-
  Starting November 30, 2024, GitHub.com customers will [no longer be able to use `actions/download-artifact@v3`](https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/). Therefore, to avoid breakage, customers who programmatically download the CodeQL Action debug artifacts should set the `CODEQL_ACTION_ARTIFACT_V4_UPGRADE` environment variable to `true` and bump `actions/download-artifact@v3` to `actions/download-artifact@v4` in their workflows. The CodeQL Action will enable this behavior by default in early November and workflows that have not yet bumped `actions/download-artifact@v3` to `actions/download-artifact@v4` will begin failing then.
-
  This change is currently unavailable for GitHub Enterprise Server customers, as `actions/upload-artifact@v4` and `actions/download-artifact@v4` are not yet compatible with GHES.
 - Update default CodeQL bundle version to 2.19.1. [#2519](https://github.com/github/codeql-action/pull/2519)

@@ -448,12 +448,9 @@ No user facing changes.
 ## 3.25.0 - 15 Apr 2024

 - The deprecated feature for extracting dependencies for a Python analysis has been removed. [#2224](https://github.com/github/codeql-action/pull/2224)
-
  As a result, the following inputs and environment variables are now ignored:
-
  - The `setup-python-dependencies` input to the `init` Action
  - The `CODEQL_ACTION_DISABLE_PYTHON_DEPENDENCY_INSTALLATION` environment variable
-
  We recommend removing any references to these from your workflows. For more information, see the release notes for CodeQL Action v3.23.0 and v2.23.0.
 - Automatically overwrite an existing database if found on the filesystem. [#2229](https://github.com/github/codeql-action/pull/2229)
 - Bump the minimum CodeQL bundle version to 2.12.6. [#2232](https://github.com/github/codeql-action/pull/2232)
--- a/analyze/action.yml
+++ b/analyze/action.yml
@@ -94,6 +94,6 @@ outputs:
  sarif-id:
    description: The ID of the uploaded SARIF file.
 runs:
-  using: node24
+  using: node20
  main: "../lib/analyze-action.js"
  post: "../lib/analyze-action-post.js"
--- a/autobuild/action.yml
+++ b/autobuild/action.yml
@@ -15,5 +15,5 @@ inputs:
      $GITHUB_WORKSPACE as its working directory.
    required: false
 runs:
-  using: node24
+  using: node20
  main: '../lib/autobuild-action.js'
--- a/init/action.yml
+++ b/init/action.yml
@@ -165,6 +165,6 @@ outputs:
  codeql-version:
    description: The version of the CodeQL binary used for analysis
 runs:
-  using: node24
+  using: node20
  main: '../lib/init-action.js'
  post: '../lib/init-action-post.js'
--- a/lib/analyze-action-post.js
+++ b/lib/analyze-action-post.js
--- a/lib/analyze-action.js
+++ b/lib/analyze-action.js
--- a/lib/autobuild-action.js
+++ b/lib/autobuild-action.js
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.24.0",
-  "cliVersion": "2.24.0",
-  "priorBundleVersion": "codeql-bundle-v2.23.9",
-  "priorCliVersion": "2.23.9"
+  "bundleVersion": "codeql-bundle-v2.24.1",
+  "cliVersion": "2.24.1",
+  "priorBundleVersion": "codeql-bundle-v2.24.0",
+  "priorCliVersion": "2.24.0"
 }
--- a/lib/init-action-post.js
+++ b/lib/init-action-post.js
--- a/lib/init-action.js
+++ b/lib/init-action.js
--- a/lib/resolve-environment-action.js
+++ b/lib/resolve-environment-action.js
--- a/lib/setup-codeql-action.js
+++ b/lib/setup-codeql-action.js
--- a/lib/start-proxy-action-post.js
+++ b/lib/start-proxy-action-post.js
--- a/lib/start-proxy-action.js
+++ b/lib/start-proxy-action.js
--- a/lib/upload-lib.js
+++ b/lib/upload-lib.js
--- a/lib/upload-sarif-action-post.js
+++ b/lib/upload-sarif-action-post.js
--- a/lib/upload-sarif-action.js
+++ b/lib/upload-sarif-action.js
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
  "name": "codeql",
-  "version": "4.32.2",
+  "version": "4.32.3",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "codeql",
-      "version": "4.32.2",
+      "version": "4.32.3",
      "license": "MIT",
      "dependencies": {
        "@actions/artifact": "^5.0.3",
@@ -14,7 +14,7 @@
        "@actions/cache": "^5.0.5",
        "@actions/core": "^2.0.3",
        "@actions/exec": "^2.0.0",
-        "@actions/github": "^8.0.0",
+        "@actions/github": "^8.0.1",
        "@actions/glob": "^0.5.0",
        "@actions/http-client": "^3.0.0",
        "@actions/io": "^2.0.0",
@@ -25,6 +25,7 @@
        "fast-deep-equal": "^3.1.3",
        "follow-redirects": "^1.15.11",
        "get-folder-size": "^5.0.0",
+        "https-proxy-agent": "^7.0.6",
        "js-yaml": "^4.1.1",
        "jsonschema": "1.4.1",
        "long": "^5.3.2",
@@ -34,7 +35,7 @@
      },
      "devDependencies": {
        "@ava/typescript": "6.0.0",
-        "@eslint/compat": "^2.0.1",
+        "@eslint/compat": "^2.0.2",
        "@eslint/eslintrc": "^3.3.3",
        "@eslint/js": "^9.39.2",
        "@microsoft/eslint-formatter-sarif": "^3.1.0",
@@ -46,7 +47,7 @@
        "@types/node-forge": "^1.3.14",
        "@types/semver": "^7.7.1",
        "@types/sinon": "^21.0.0",
-        "@typescript-eslint/eslint-plugin": "^8.53.1",
+        "@typescript-eslint/eslint-plugin": "^8.54.0",
        "@typescript-eslint/parser": "^8.48.0",
        "ava": "^6.4.1",
        "esbuild": "^0.27.2",
@@ -55,7 +56,7 @@
        "eslint-plugin-filenames": "^1.3.2",
        "eslint-plugin-github": "^5.1.8",
        "eslint-plugin-import": "2.29.1",
-        "eslint-plugin-jsdoc": "^62.3.0",
+        "eslint-plugin-jsdoc": "^62.5.0",
        "eslint-plugin-no-async-foreach": "^0.1.1",
        "glob": "^11.1.0",
        "nock": "^14.0.10",
@@ -395,18 +396,18 @@
      }
    },
    "node_modules/@actions/github": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/@actions/github/-/github-8.0.0.tgz",
-      "integrity": "sha512-bBukvVRvIf7NshWEXFVnBaXs/ZyGzDvx+jbB5AdJij9CUG4VFEYJJD6T6y06dDkuULalQQUNvKXIH71yqw7SoQ==",
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/@actions/github/-/github-8.0.1.tgz",
+      "integrity": "sha512-cue7mS+kx1/2Dnc/094pitRUm+0uPXVXYVaqOdZwD15BsXATWYHW3idJDYOlyBc5gJlzAQ/w5YLU4LR8D7hjVg==",
      "license": "MIT",
      "dependencies": {
-        "@actions/http-client": "^3.0.1",
+        "@actions/http-client": "^3.0.2",
        "@octokit/core": "^7.0.6",
        "@octokit/plugin-paginate-rest": "^14.0.0",
        "@octokit/plugin-rest-endpoint-methods": "^17.0.0",
        "@octokit/request": "^10.0.7",
        "@octokit/request-error": "^7.1.0",
-        "undici": "^5.28.5"
+        "undici": "^6.23.0"
      }
    },
    "node_modules/@actions/github/node_modules/@octokit/plugin-paginate-rest": {
@@ -439,6 +440,15 @@
        "@octokit/core": ">=6"
      }
    },
+    "node_modules/@actions/github/node_modules/undici": {
+      "version": "6.23.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.23.0.tgz",
+      "integrity": "sha512-VfQPToRA5FZs/qJxLIinmU59u0r7LXqoJkCzinq3ckNJp3vKEh7jTWN589YQ5+aoAC/TGRLyJLCPKcLQbM8r9g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.17"
+      }
+    },
    "node_modules/@actions/glob": {
      "version": "0.5.1",
      "resolved": "https://registry.npmjs.org/@actions/glob/-/glob-0.5.1.tgz",
@@ -808,15 +818,15 @@
      }
    },
    "node_modules/@es-joy/jsdoccomment": {
-      "version": "0.82.0",
-      "resolved": "https://registry.npmjs.org/@es-joy/jsdoccomment/-/jsdoccomment-0.82.0.tgz",
-      "integrity": "sha512-xs3OTxPefjTZaoDS7H1X2pV33enAmZg+8YldjmeYk7XZnq420phdnp6o0JtrsHBdSRJ5+RTocgyED9TL3epgpw==",
+      "version": "0.83.0",
+      "resolved": "https://registry.npmjs.org/@es-joy/jsdoccomment/-/jsdoccomment-0.83.0.tgz",
+      "integrity": "sha512-e1MHSEPJ4m35zkBvNT6kcdeH1SvMaJDsPC3Xhfseg3hvF50FUE3f46Yn36jgbrPYYXezlWUQnevv23c+lx2MCA==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
        "@types/estree": "^1.0.8",
        "@typescript-eslint/types": "^8.53.1",
-        "comment-parser": "1.4.4",
+        "comment-parser": "1.4.5",
        "esquery": "^1.7.0",
        "jsdoc-type-pratt-parser": "~7.1.0"
      },
@@ -1332,19 +1342,19 @@
      }
    },
    "node_modules/@eslint/compat": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/@eslint/compat/-/compat-2.0.1.tgz",
-      "integrity": "sha512-yl/JsgplclzuvGFNqwNYV4XNPhP3l62ZOP9w/47atNAdmDtIFCx6X7CSk/SlWUuBGkT4Et/5+UD+WyvX2iiIWA==",
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@eslint/compat/-/compat-2.0.2.tgz",
+      "integrity": "sha512-pR1DoD0h3HfF675QZx0xsyrsU8q70Z/plx7880NOhS02NuWLgBCOMDL787nUeQ7EWLkxv3bPQJaarjcPQb2Dwg==",
      "dev": true,
      "license": "Apache-2.0",
      "dependencies": {
-        "@eslint/core": "^1.0.1"
+        "@eslint/core": "^1.1.0"
      },
      "engines": {
        "node": "^20.19.0 || ^22.13.0 || >=24"
      },
      "peerDependencies": {
-        "eslint": "^8.40 || 9"
+        "eslint": "^8.40 || 9 || 10"
      },
      "peerDependenciesMeta": {
        "eslint": {
@@ -1353,9 +1363,9 @@
      }
    },
    "node_modules/@eslint/core": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-1.0.1.tgz",
-      "integrity": "sha512-r18fEAj9uCk+VjzGt2thsbOmychS+4kxI14spVNibUO2vqKX7obOG+ymZljAwuPZl+S3clPGwCwTDtrdqTiY6Q==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-1.1.0.tgz",
+      "integrity": "sha512-/nr9K9wkr3P1EzFTdFdMoLuo1PmIxjmwvPozwoSodjNBdefGujXQUF93u1DDZpEaTuDvMsIQddsd35BwtrW9Xw==",
      "dev": true,
      "license": "Apache-2.0",
      "dependencies": {
@@ -2183,17 +2193,17 @@
      "license": "MIT"
    },
    "node_modules/@typescript-eslint/eslint-plugin": {
-      "version": "8.53.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.53.1.tgz",
-      "integrity": "sha512-cFYYFZ+oQFi6hUnBTbLRXfTJiaQtYE3t4O692agbBl+2Zy+eqSKWtPjhPXJu1G7j4RLjKgeJPDdq3EqOwmX5Ag==",
+      "version": "8.54.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.54.0.tgz",
+      "integrity": "sha512-hAAP5io/7csFStuOmR782YmTthKBJ9ND3WVL60hcOjvtGFb+HJxH4O5huAcmcZ9v9G8P+JETiZ/G1B8MALnWZQ==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
        "@eslint-community/regexpp": "^4.12.2",
-        "@typescript-eslint/scope-manager": "8.53.1",
-        "@typescript-eslint/type-utils": "8.53.1",
-        "@typescript-eslint/utils": "8.53.1",
-        "@typescript-eslint/visitor-keys": "8.53.1",
+        "@typescript-eslint/scope-manager": "8.54.0",
+        "@typescript-eslint/type-utils": "8.54.0",
+        "@typescript-eslint/utils": "8.54.0",
+        "@typescript-eslint/visitor-keys": "8.54.0",
        "ignore": "^7.0.5",
        "natural-compare": "^1.4.0",
        "ts-api-utils": "^2.4.0"
@@ -2206,7 +2216,7 @@
        "url": "https://opencollective.com/typescript-eslint"
      },
      "peerDependencies": {
-        "@typescript-eslint/parser": "^8.53.1",
+        "@typescript-eslint/parser": "^8.54.0",
        "eslint": "^8.57.0 || ^9.0.0",
        "typescript": ">=4.8.4 <6.0.0"
      }
@@ -2231,14 +2241,14 @@
      }
    },
    "node_modules/@typescript-eslint/eslint-plugin/node_modules/@typescript-eslint/scope-manager": {
-      "version": "8.53.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-8.53.1.tgz",
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-      "version": "8.53.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-8.53.1.tgz",
-      "integrity": "sha512-oy+wV7xDKFPRyNggmXuZQSBzvoLnpmJs+GhzRhPjrxl2b/jIlyjVokzm47CZCDUdXKr2zd7ZLodPfOBpOPyPlg==",
+      "version": "8.54.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-8.54.0.tgz",
+      "integrity": "sha512-VFlhGSl4opC0bprJiItPQ1RfUhGDIBokcPwaFH4yiBCaNPeld/9VeXbiPO1cLyorQi1G1vL+ecBk1x8o1axORA==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
-        "@typescript-eslint/types": "8.53.1",
+        "@typescript-eslint/types": "8.54.0",
        "eslint-visitor-keys": "^4.2.1"
      },
      "engines": {
@@ -3966,9 +3976,9 @@
      "license": "MIT"
    },
    "node_modules/comment-parser": {
-      "version": "1.4.4",
-      "resolved": "https://registry.npmjs.org/comment-parser/-/comment-parser-1.4.4.tgz",
-      "integrity": "sha512-0D6qSQ5IkeRrGJFHRClzaMOenMeT0gErz3zIw3AprKMqhRN6LNU2jQOdkPG/FZ+8bCgXE1VidrgSzlBBDZRr8A==",
+      "version": "1.4.5",
+      "resolved": "https://registry.npmjs.org/comment-parser/-/comment-parser-1.4.5.tgz",
+      "integrity": "sha512-aRDkn3uyIlCFfk5NUA+VdwMmMsh8JGhc4hapfV4yxymHGQ3BVskMQfoXGpCo5IoBuQ9tS5iiVKhCpTcB4pW4qw==",
      "dev": true,
      "license": "MIT",
      "engines": {
@@ -4876,16 +4886,16 @@
      }
    },
    "node_modules/eslint-plugin-jsdoc": {
-      "version": "62.3.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-62.3.0.tgz",
-      "integrity": "sha512-Gc5Ls5qQC6NwqtQTtJ2JE5BwvX348ZCZ+4+QiZ9RpoQ1TCcxFF8Z0E5jaLkTyYNqyhx+uKAvljNHE0B7PBw+iw==",
+      "version": "62.5.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-62.5.0.tgz",
+      "integrity": "sha512-D+1haMVDzW/ZMoPwOnsbXCK07rJtsq98Z1v+ApvDKxSzYTTcPgmFc/nyUDCGmxm2cP7g7hszyjYHO7Zodl/43w==",
      "dev": true,
      "license": "BSD-3-Clause",
      "dependencies": {
-        "@es-joy/jsdoccomment": "~0.82.0",
+        "@es-joy/jsdoccomment": "~0.83.0",
        "@es-joy/resolve.exports": "1.2.0",
        "are-docs-informative": "^0.0.2",
-        "comment-parser": "1.4.4",
+        "comment-parser": "1.4.5",
        "debug": "^4.4.3",
        "escape-string-regexp": "^4.0.0",
        "espree": "^11.1.0",
@@ -5990,6 +6000,7 @@
      "version": "7.0.6",
      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-7.0.6.tgz",
      "integrity": "sha512-vK9P5/iUfdl95AI+JVyUuIcVtd4ofvtrOr3HNtM2yxC9bnMbEdp3x01OhQNnjb8IJYi38VlTE3mBXwcfvywuSw==",
+      "license": "MIT",
      "dependencies": {
        "agent-base": "^7.1.2",
        "debug": "4"
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "codeql",
-  "version": "4.32.2",
+  "version": "3.32.3",
  "private": true,
  "description": "CodeQL action",
  "scripts": {
@@ -29,7 +29,7 @@
    "@actions/cache": "^5.0.5",
    "@actions/core": "^2.0.3",
    "@actions/exec": "^2.0.0",
-    "@actions/github": "^8.0.0",
+    "@actions/github": "^8.0.1",
    "@actions/glob": "^0.5.0",
    "@actions/http-client": "^3.0.0",
    "@actions/io": "^2.0.0",
@@ -40,6 +40,7 @@
    "fast-deep-equal": "^3.1.3",
    "follow-redirects": "^1.15.11",
    "get-folder-size": "^5.0.0",
+    "https-proxy-agent": "^7.0.6",
    "js-yaml": "^4.1.1",
    "jsonschema": "1.4.1",
    "long": "^5.3.2",
@@ -49,7 +50,7 @@
  },
  "devDependencies": {
    "@ava/typescript": "6.0.0",
-    "@eslint/compat": "^2.0.1",
+    "@eslint/compat": "^2.0.2",
    "@eslint/eslintrc": "^3.3.3",
    "@eslint/js": "^9.39.2",
    "@microsoft/eslint-formatter-sarif": "^3.1.0",
@@ -61,7 +62,7 @@
    "@types/node-forge": "^1.3.14",
    "@types/semver": "^7.7.1",
    "@types/sinon": "^21.0.0",
-    "@typescript-eslint/eslint-plugin": "^8.53.1",
+    "@typescript-eslint/eslint-plugin": "^8.54.0",
    "@typescript-eslint/parser": "^8.48.0",
    "ava": "^6.4.1",
    "esbuild": "^0.27.2",
@@ -70,7 +71,7 @@
    "eslint-plugin-filenames": "^1.3.2",
    "eslint-plugin-github": "^5.1.8",
    "eslint-plugin-import": "2.29.1",
-    "eslint-plugin-jsdoc": "^62.3.0",
+    "eslint-plugin-jsdoc": "^62.5.0",
    "eslint-plugin-no-async-foreach": "^0.1.1",
    "glob": "^11.1.0",
    "nock": "^14.0.10",
--- a/pr-checks/checks/rubocop-multi-language.yml
+++ b/pr-checks/checks/rubocop-multi-language.yml
@@ -4,7 +4,7 @@ description: "Tests using RuboCop to analyze a multi-language repository and the
 versions: ["default"]
 steps:
  - name: Set up Ruby
-    uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1.286.0
+    uses: ruby/setup-ruby@09a7688d3b55cf0e976497ff046b70949eeaccfd # v1.288.0
    with:
      ruby-version: 2.6
  - name: Install Code Scanning integration
--- a/resolve-environment/action.yml
+++ b/resolve-environment/action.yml
@@ -21,5 +21,5 @@ outputs:
  environment:
    description: The inferred build environment configuration.
 runs:
-  using: node24
+  using: node20
  main: '../lib/resolve-environment-action.js'
--- a/setup-codeql/action.yml
+++ b/setup-codeql/action.yml
@@ -35,5 +35,5 @@ outputs:
  codeql-version:
    description: The version of the CodeQL binary that was installed.
 runs:
-  using: node24
+  using: node20
  main: '../lib/setup-codeql-action.js'
--- a/src/api-client.test.ts
+++ b/src/api-client.test.ts
@@ -36,6 +36,9 @@ test("getApiClient", async (t) => {
      baseUrl: "http://api.github.localhost",
      log: sinon.match.any,
      userAgent: `CodeQL-Action/${actionsUtil.getActionVersion()}`,
+      retry: {
+        doNotRetry: [400, 410, 422, 451],
+      },
    }),
  );
 });
--- a/src/api-client.ts
+++ b/src/api-client.ts
@@ -51,6 +51,12 @@ function createApiClientWithDetails(
        warn: core.warning,
        error: core.error,
      },
+      retry: {
+        // The default is 400, 401, 403, 404, 410, 422, and 451. We have observed transient errors
+        // with authentication, so we remove 401, 403, and 404 from the default list to ensure that
+        // these errors are retried.
+        doNotRetry: [400, 410, 422, 451],
+      },
    }),
  );
 }
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.24.0",
-  "cliVersion": "2.24.0",
-  "priorBundleVersion": "codeql-bundle-v2.23.9",
-  "priorCliVersion": "2.23.9"
+  "bundleVersion": "codeql-bundle-v2.24.1",
+  "cliVersion": "2.24.1",
+  "priorBundleVersion": "codeql-bundle-v2.24.0",
+  "priorCliVersion": "2.24.0"
 }
--- a/src/feature-flags.test.ts
+++ b/src/feature-flags.test.ts
@@ -4,6 +4,7 @@ import * as path from "path";
 import test, { ExecutionContext } from "ava";

 import * as defaults from "./defaults.json";
+import { EnvVar } from "./environment";
 import {
  Feature,
  featureConfig,
@@ -37,29 +38,39 @@ test.beforeEach(() => {

 const testRepositoryNwo = parseRepositoryNwo("github/example");

-test(`All features are disabled if running against GHES`, async (t) => {
+test(`All features use default values if running against GHES`, async (t) => {
  await withTmpDir(async (tmpDir) => {
-    const loggedMessages = [];
+    const loggedMessages: LoggedMessage[] = [];
    const features = setUpFeatureFlagTests(
      tmpDir,
      getRecordingLogger(loggedMessages),
      { type: GitHubVariant.GHES, version: "3.0.0" },
    );

-    for (const feature of Object.values(Feature)) {
-      t.deepEqual(
-        await getFeatureIncludingCodeQlIfRequired(features, feature),
-        featureConfig[feature].defaultValue,
-      );
-    }
+    await assertAllFeaturesHaveDefaultValues(t, features);
+    assertLoggedMessage(
+      t,
+      loggedMessages,
+      "Not running against github.com. Using default values for all features.",
+    );
+  });
+});

-    t.assert(
-      loggedMessages.find(
-        (v: LoggedMessage) =>
-          v.type === "debug" &&
-          v.message ===
-            "Not running against github.com. Disabling all toggleable features.",
-      ) !== undefined,
+test(`All features use default values if running in CCR`, async (t) => {
+  await withTmpDir(async (tmpDir) => {
+    const loggedMessages: LoggedMessage[] = [];
+    const features = setUpFeatureFlagTests(
+      tmpDir,
+      getRecordingLogger(loggedMessages),
+    );
+
+    process.env[EnvVar.ANALYSIS_KEY] = "dynamic/copilot-pull-request-reviewer";
+
+    await assertAllFeaturesHaveDefaultValues(t, features);
+    assertLoggedMessage(
+      t,
+      loggedMessages,
+      "Feature flags are not supported in Copilot Code Review. Using default values for all features.",
    );
  });
 });
@@ -542,6 +553,30 @@ test("non-legacy feature flags should not start with codeql_action_", async (t)
  }
 });

+async function assertAllFeaturesHaveDefaultValues(
+  t: ExecutionContext<unknown>,
+  features: FeatureEnablement,
+) {
+  for (const feature of Object.values(Feature)) {
+    t.deepEqual(
+      await getFeatureIncludingCodeQlIfRequired(features, feature),
+      featureConfig[feature].defaultValue,
+    );
+  }
+}
+
+function assertLoggedMessage(
+  t: ExecutionContext<unknown>,
+  loggedMessages: LoggedMessage[],
+  expectedMessage: string,
+) {
+  t.assert(
+    loggedMessages.find(
+      (v: LoggedMessage) => v.type === "debug" && v.message === expectedMessage,
+    ) !== undefined,
+  );
+}
+
 function assertAllFeaturesUndefinedInApi(
  t: ExecutionContext<unknown>,
  loggedMessages: LoggedMessage[],
--- a/src/feature-flags.ts
+++ b/src/feature-flags.ts
@@ -3,6 +3,7 @@ import * as path from "path";

 import * as semver from "semver";

+import { isCCR } from "./actions-util";
 import { getApiClient } from "./api-client";
 import type { CodeQL } from "./codeql";
 import * as defaults from "./defaults.json";
@@ -72,6 +73,7 @@ export enum Feature {
  QaTelemetryEnabled = "qa_telemetry_enabled",
  /** Note that this currently only disables baseline file coverage information. */
  SkipFileCoverageOnPrs = "skip_file_coverage_on_prs",
+  StartProxyConnectionChecks = "start_proxy_connection_checks",
  UploadOverlayDbToApi = "upload_overlay_db_to_api",
  UseRepositoryProperties = "use_repository_properties",
  ValidateDbConfig = "validate_db_config",
@@ -297,6 +299,11 @@ export const featureConfig = {
    // cannot be found when interpreting results.
    minimumVersion: undefined,
  },
+  [Feature.StartProxyConnectionChecks]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_START_PROXY_CONNECTION_CHECKS",
+    minimumVersion: undefined,
+  },
  [Feature.UploadOverlayDbToApi]: {
    defaultValue: false,
    envVar: "CODEQL_ACTION_UPLOAD_OVERLAY_DB_TO_API",
@@ -658,7 +665,14 @@ class GitHubFeatureFlags {
    // Do nothing when not running against github.com
    if (!supportsFeatureFlags(this.gitHubVersion.type)) {
      this.logger.debug(
-        "Not running against github.com. Disabling all toggleable features.",
+        "Not running against github.com. Using default values for all features.",
+      );
+      this.hasAccessedRemoteFeatureFlags = false;
+      return {};
+    }
+    if (isCCR()) {
+      this.logger.debug(
+        "Feature flags are not supported in Copilot Code Review. Using default values for all features.",
      );
      this.hasAccessedRemoteFeatureFlags = false;
      return {};
--- a/src/start-proxy-action.ts
+++ b/src/start-proxy-action.ts
@@ -5,18 +5,24 @@ import * as core from "@actions/core";
 import { pki } from "node-forge";

 import * as actionsUtil from "./actions-util";
+import { getGitHubVersion } from "./api-client";
+import { Feature, Features } from "./feature-flags";
 import { KnownLanguage } from "./languages";
 import { getActionsLogger, Logger } from "./logging";
+import { getRepositoryNwo } from "./repository";
 import {
-  Credential,
  credentialToStr,
  getCredentials,
  getProxyBinaryPath,
  getSafeErrorMessage,
  parseLanguage,
+  ProxyInfo,
  sendFailedStatusReport,
  sendSuccessStatusReport,
+  Credential,
+  Registry,
 } from "./start-proxy";
+import { checkConnections } from "./start-proxy/reachability";
 import { ActionName, sendUnhandledErrorStatusReport } from "./status-report";
 import * as util from "./util";

@@ -34,6 +40,7 @@ type BasicAuthCredentials = {
 };

 type ProxyConfig = {
+  /** The validated configurations for the proxy. */
  all_credentials: Credential[];
  ca: CertificateAuthority;
  proxy_auth?: BasicAuthCredentials;
@@ -92,6 +99,7 @@ async function run(startedAt: Date) {
  // possible, and only use safe functions outside.

  const logger = getActionsLogger();
+  let features: Features | undefined;
  let language: KnownLanguage | undefined;

  try {
@@ -103,9 +111,21 @@ async function run(startedAt: Date) {
    const proxyLogFilePath = path.resolve(tempDir, "proxy.log");
    core.saveState("proxy-log-file", proxyLogFilePath);

-    // Get the configuration options
+    // Initialise FFs.
+    const repositoryNwo = getRepositoryNwo();
+    const gitHubVersion = await getGitHubVersion();
+    features = new Features(
+      gitHubVersion,
+      repositoryNwo,
+      actionsUtil.getTemporaryDirectory(),
+      logger,
+    );
+
+    // Get the language input.
    const languageInput = actionsUtil.getOptionalInput("language");
    language = languageInput ? parseLanguage(languageInput) : undefined;
+
+    // Get the registry configurations from one of the inputs.
    const credentials = getCredentials(
      logger,
      actionsUtil.getOptionalInput("registry_secrets"),
@@ -133,7 +153,17 @@ async function run(startedAt: Date) {

    // Start the Proxy
    const proxyBin = await getProxyBinaryPath(logger);
-    await startProxy(proxyBin, proxyConfig, proxyLogFilePath, logger);
+    const proxyInfo = await startProxy(
+      proxyBin,
+      proxyConfig,
+      proxyLogFilePath,
+      logger,
+    );
+
+    // Check that the private registries are reachable.
+    if (await features.getValue(Feature.StartProxyConnectionChecks)) {
+      await checkConnections(logger, proxyInfo);
+    }

    // Report success if we have reached this point.
    await sendSuccessStatusReport(
@@ -171,7 +201,7 @@ async function startProxy(
  config: ProxyConfig,
  logFilePath: string,
  logger: Logger,
-) {
+): Promise<ProxyInfo> {
  const host = "127.0.0.1";
  let port = 49152;
  let subprocess: ChildProcess | undefined = undefined;
@@ -214,13 +244,15 @@ async function startProxy(
  core.setOutput("proxy_port", port.toString());
  core.setOutput("proxy_ca_certificate", config.ca.cert);

-  const registry_urls = config.all_credentials
+  const registry_urls: Registry[] = config.all_credentials
    .filter((credential) => credential.url !== undefined)
    .map((credential) => ({
      type: credential.type,
      url: credential.url,
    }));
  core.setOutput("proxy_urls", JSON.stringify(registry_urls));
+
+  return { host, port, cert: config.ca.cert, registries: registry_urls };
 }

 void runWrapper();
--- a/src/start-proxy.test.ts
+++ b/src/start-proxy.test.ts
@@ -175,6 +175,27 @@ test("getCredentials throws error when credential is not an object", async (t) =
  }
 });

+test("getCredentials throws error when credential is missing type", async (t) => {
+  const testCredentials = [[{ token: "abc", url: "https://localhost" }]].map(
+    toEncodedJSON,
+  );
+
+  for (const testCredential of testCredentials) {
+    t.throws(
+      () =>
+        startProxyExports.getCredentials(
+          getRunnerLogger(true),
+          undefined,
+          testCredential,
+          undefined,
+        ),
+      {
+        message: "Invalid credentials - must have a type",
+      },
+    );
+  }
+});
+
 test("getCredentials throws error when credential missing host and url", async (t) => {
  const testCredentials = [
    [{ type: "npm_registry", token: "abc" }],
@@ -396,13 +417,14 @@ test("credentialToStr - hides passwords", (t) => {
  const credential = {
    type: "maven_credential",
    password: secret,
+    url: "https://localhost",
  };

  const str = startProxyExports.credentialToStr(credential);

  t.false(str.includes(secret));
  t.is(
-    "Type: maven_credential; Host: undefined; Url: undefined Username: undefined; Password: true; Token: false",
+    "Type: maven_credential; Host: undefined; Url: https://localhost Username: undefined; Password: true; Token: false",
    str,
  );
 });
@@ -412,13 +434,14 @@ test("credentialToStr - hides tokens", (t) => {
  const credential = {
    type: "maven_credential",
    token: secret,
+    url: "https://localhost",
  };

  const str = startProxyExports.credentialToStr(credential);

  t.false(str.includes(secret));
  t.is(
-    "Type: maven_credential; Host: undefined; Url: undefined Username: undefined; Password: false; Token: true",
+    "Type: maven_credential; Host: undefined; Url: https://localhost Username: undefined; Password: false; Token: true",
    str,
  );
 });
--- a/src/start-proxy.ts
+++ b/src/start-proxy.ts
@@ -13,6 +13,12 @@ import { Config } from "./config-utils";
 import * as defaults from "./defaults.json";
 import { KnownLanguage } from "./languages";
 import { Logger } from "./logging";
+import {
+  Address,
+  RawCredential,
+  Registry,
+  Credential,
+} from "./start-proxy/types";
 import {
  ActionName,
  createStatusReportBase,
@@ -23,6 +29,8 @@ import {
 import * as util from "./util";
 import { ConfigurationError, getErrorMessage, isDefined } from "./util";

+export * from "./start-proxy/types";
+
 /**
 * Enumerates specific error types for which we have corresponding error messages that
 * are safe to include in status reports.
@@ -161,15 +169,6 @@ export const UPDATEJOB_PROXY_VERSION = "v2.0.20250624110901";
 const UPDATEJOB_PROXY_URL_PREFIX =
  "https://github.com/github/codeql-action/releases/download/codeql-bundle-v2.22.0/";

-export type Credential = {
-  type: string;
-  host?: string;
-  url?: string;
-  username?: string;
-  password?: string;
-  token?: string;
-};
-
 /*
 * Language aliases supported by the start-proxy Action.
 *
@@ -229,6 +228,31 @@ const LANGUAGE_TO_REGISTRY_TYPE: Partial<Record<KnownLanguage, string[]>> = {
  go: ["goproxy_server", "git_source"],
 } as const;

+/**
+ * Extracts an `Address` value from the given `Registry` value by determining whether it has
+ * a `url` value, or no `url` value but a `host` value.
+ *
+ * @throws A `ConfigurationError` if the `Registry` value contains neither a `url` or `host` field.
+ */
+function getRegistryAddress(registry: Partial<Registry>): Address {
+  if (isDefined(registry.url)) {
+    return {
+      url: registry.url,
+      host: registry.host,
+    };
+  } else if (isDefined(registry.host)) {
+    return {
+      url: undefined,
+      host: registry.host,
+    };
+  } else {
+    // The proxy needs one of these to work. If both are defined, the url has the precedence.
+    throw new ConfigurationError(
+      "Invalid credentials - must specify host or url",
+    );
+  }
+}
+
 // getCredentials returns registry credentials from action inputs.
 // It prefers `registries_credentials` over `registry_secrets`.
 // If neither is set, it returns an empty array.
@@ -255,9 +279,9 @@ export function getCredentials(
  }

  // Parse and validate the credentials
-  let parsed: Credential[];
+  let parsed: RawCredential[];
  try {
-    parsed = JSON.parse(credentialsStr) as Credential[];
+    parsed = JSON.parse(credentialsStr) as RawCredential[];
  } catch {
    // Don't log the error since it might contain sensitive information.
    logger.error("Failed to parse the credentials data.");
@@ -277,6 +301,11 @@ export function getCredentials(
      throw new ConfigurationError("Invalid credentials - must be an object");
    }

+    // The configuration must have a type.
+    if (!isDefined(e.type)) {
+      throw new ConfigurationError("Invalid credentials - must have a type");
+    }
+
    // Mask credentials to reduce chance of accidental leakage in logs.
    if (isDefined(e.password)) {
      core.setSecret(e.password);
@@ -285,12 +314,7 @@ export function getCredentials(
      core.setSecret(e.token);
    }

-    if (!isDefined(e.url) && !isDefined(e.host)) {
-      // The proxy needs one of these to work. If both are defined, the url has the precedence.
-      throw new ConfigurationError(
-        "Invalid credentials - must specify host or url",
-      );
-    }
+    const address = getRegistryAddress(e);

    // Filter credentials based on language if specified. `type` is the registry type.
    // E.g., "maven_feed" for Java/Kotlin, "nuget_repository" for C#.
@@ -333,11 +357,10 @@ export function getCredentials(

    out.push({
      type: e.type,
-      host: e.host,
-      url: e.url,
      username: e.username,
      password: e.password,
      token: e.token,
+      ...address,
    });
  }
  return out;
--- a/src/start-proxy/reachability.test.ts
+++ b/src/start-proxy/reachability.test.ts
@@ -0,0 +1,120 @@
+import test from "ava";
+import * as sinon from "sinon";
+
+import {
+  checkExpectedLogMessages,
+  setupTests,
+  withRecordingLoggerAsync,
+} from "./../testing-utils";
+import {
+  checkConnections,
+  ReachabilityBackend,
+  ReachabilityError,
+} from "./reachability";
+import { ProxyInfo, Registry } from "./types";
+
+setupTests(test);
+
+class MockReachabilityBackend implements ReachabilityBackend {
+  public async checkConnection(_url: URL): Promise<number> {
+    return 200;
+  }
+}
+
+const mavenRegistry: Registry = {
+  type: "maven_registry",
+  url: "https://repo.maven.apache.org/maven2/",
+};
+
+const nugetFeed: Registry = {
+  type: "nuget_feed",
+  url: "https://api.nuget.org/v3/index.json",
+};
+
+const proxyInfo: ProxyInfo = {
+  host: "127.0.0.1",
+  port: 1080,
+  cert: "",
+  registries: [mavenRegistry, nugetFeed],
+};
+
+test("checkConnections - basic functionality", async (t) => {
+  const backend = new MockReachabilityBackend();
+  const messages = await withRecordingLoggerAsync(async (logger) => {
+    const reachable = await checkConnections(logger, proxyInfo, backend);
+    t.is(reachable.size, proxyInfo.registries.length);
+    t.true(reachable.has(mavenRegistry));
+    t.true(reachable.has(nugetFeed));
+  });
+  checkExpectedLogMessages(t, messages, [
+    `Testing connection to ${mavenRegistry.url}`,
+    `Successfully tested connection to ${mavenRegistry.url}`,
+    `Testing connection to ${nugetFeed.url}`,
+    `Successfully tested connection to ${nugetFeed.url}`,
+    `Finished testing connections`,
+  ]);
+});
+
+test("checkConnections - excludes failed status codes", async (t) => {
+  const backend = new MockReachabilityBackend();
+  sinon
+    .stub(backend, "checkConnection")
+    .onSecondCall()
+    .throws(new ReachabilityError(400));
+  const messages = await withRecordingLoggerAsync(async (logger) => {
+    const reachable = await checkConnections(logger, proxyInfo, backend);
+    t.is(reachable.size, 1);
+    t.true(reachable.has(mavenRegistry));
+  });
+  checkExpectedLogMessages(t, messages, [
+    `Testing connection to ${mavenRegistry.url}`,
+    `Successfully tested connection to ${mavenRegistry.url}`,
+    `Testing connection to ${nugetFeed.url}`,
+    `Connection test to ${nugetFeed.url} failed. (400)`,
+    `Finished testing connections`,
+  ]);
+});
+
+test("checkConnections - handles other exceptions", async (t) => {
+  const backend = new MockReachabilityBackend();
+  sinon
+    .stub(backend, "checkConnection")
+    .onSecondCall()
+    .throws(new Error("Some generic error"));
+  const messages = await withRecordingLoggerAsync(async (logger) => {
+    const reachable = await checkConnections(logger, proxyInfo, backend);
+    t.is(reachable.size, 1);
+    t.true(reachable.has(mavenRegistry));
+  });
+  checkExpectedLogMessages(t, messages, [
+    `Testing connection to ${mavenRegistry.url}`,
+    `Successfully tested connection to ${mavenRegistry.url}`,
+    `Testing connection to ${nugetFeed.url}`,
+    `Connection test to ${nugetFeed.url} failed: Some generic error`,
+    `Finished testing connections`,
+  ]);
+});
+
+test("checkConnections - handles invalid URLs", async (t) => {
+  const backend = new MockReachabilityBackend();
+  const messages = await withRecordingLoggerAsync(async (logger) => {
+    const reachable = await checkConnections(
+      logger,
+      {
+        ...proxyInfo,
+        registries: [
+          {
+            type: "nuget_feed",
+            url: "localhost",
+          },
+        ],
+      },
+      backend,
+    );
+    t.is(reachable.size, 0);
+  });
+  checkExpectedLogMessages(t, messages, [
+    `Skipping check for localhost since it is not a valid URL.`,
+    `Finished testing connections`,
+  ]);
+});
--- a/src/start-proxy/reachability.ts
+++ b/src/start-proxy/reachability.ts
@@ -0,0 +1,130 @@
+import * as https from "https";
+
+import { HttpsProxyAgent } from "https-proxy-agent";
+
+import { Logger } from "../logging";
+import { getErrorMessage } from "../util";
+
+import { getAddressString, ProxyInfo, Registry } from "./types";
+
+export class ReachabilityError extends Error {
+  constructor(public readonly statusCode?: number | undefined) {
+    super();
+  }
+}
+
+/**
+ * Abstracts over the backend for the reachability checks,
+ * to allow actual networking to be replaced with stubs.
+ */
+export interface ReachabilityBackend {
+  /**
+   * Performs a test HTTP request to the specified `url`. Resolves to the status code,
+   * if a successful status code was obtained. Otherwise throws
+   *
+   * @param url The URL of the registry to try and reach.
+   * @returns The successful status code (in the `<400` range).
+   */
+  checkConnection: (url: URL) => Promise<number>;
+}
+
+class NetworkReachabilityBackend implements ReachabilityBackend {
+  private agent: https.Agent;
+
+  constructor(private readonly proxy: ProxyInfo) {
+    this.agent = new HttpsProxyAgent(`http://${proxy.host}:${proxy.port}`);
+  }
+
+  public async checkConnection(url: URL): Promise<number> {
+    return new Promise((resolve, reject) => {
+      const req = https.request(
+        url,
+        {
+          agent: this.agent,
+          method: "HEAD",
+          ca: this.proxy.cert,
+          timeout: 5 * 1000, // 5 seconds
+        },
+        (res) => {
+          res.destroy();
+
+          if (res.statusCode !== undefined && res.statusCode < 400) {
+            resolve(res.statusCode);
+          } else {
+            reject(new ReachabilityError(res.statusCode));
+          }
+        },
+      );
+      req.on("error", (e) => {
+        reject(e);
+      });
+      req.on("timeout", () => {
+        req.destroy();
+        reject(new Error("Connection timeout."));
+      });
+      req.end();
+    });
+  }
+}
+
+/**
+ * Determines which configured registries can be reached by performing test requests to them.
+ *
+ * @param logger The logger to use.
+ * @param proxy Information about the proxy, including the configured registries.
+ * @param backend Optionally for testing, a `ReachabilityBackend` to use.
+ * @returns The set of registries which passed the checks.
+ */
+export async function checkConnections(
+  logger: Logger,
+  proxy: ProxyInfo,
+  backend?: ReachabilityBackend,
+): Promise<Set<Registry>> {
+  const result: Set<Registry> = new Set();
+
+  // Don't do anything if there are no registries.
+  if (proxy.registries.length === 0) return result;
+
+  try {
+    // Initialise a networking backend if no backend was provided.
+    if (backend === undefined) {
+      backend = new NetworkReachabilityBackend(proxy);
+    }
+
+    for (const registry of proxy.registries) {
+      const address = getAddressString(registry);
+      const url = URL.parse(address);
+
+      if (url === null) {
+        logger.info(
+          `Skipping check for ${address} since it is not a valid URL.`,
+        );
+        continue;
+      }
+
+      try {
+        logger.debug(`Testing connection to ${url}...`);
+        const statusCode = await backend.checkConnection(url);
+
+        logger.info(`Successfully tested connection to ${url} (${statusCode})`);
+        result.add(registry);
+      } catch (e) {
+        if (e instanceof ReachabilityError && e.statusCode !== undefined) {
+          logger.error(`Connection test to ${url} failed. (${e.statusCode})`);
+        } else {
+          logger.error(
+            `Connection test to ${url} failed: ${getErrorMessage(e)}`,
+          );
+        }
+      }
+    }
+
+    logger.debug(`Finished testing connections to private registries.`);
+  } catch (e) {
+    logger.error(
+      `Failed to test connections to private registries: ${getErrorMessage(e)}`,
+    );
+  }
+
+  return result;
+}
--- a/src/start-proxy/types.ts
+++ b/src/start-proxy/types.ts
@@ -0,0 +1,61 @@
+/**
+ * After parsing configurations from JSON, we don't know whether all the keys we expect are
+ * present or not. This type is used to represent such values, which we expect to be
+ * `Credential` values, but haven't validated yet.
+ */
+export type RawCredential = Partial<Credential>;
+
+/**
+ * A package registry configuration includes identifying information as well as
+ * authentication credentials.
+ */
+export type Credential = {
+  /** The username needed to authenticate to the package registry, if any. */
+  username?: string;
+  /** The password needed to authenticate to the package registry, if any. */
+  password?: string;
+  /** The token needed to authenticate to the package registry, if any. */
+  token?: string;
+} & Registry;
+
+/** A package registry is identified by its type and address. */
+export type Registry = {
+  /** The type of the package registry. */
+  type: string;
+} & Address;
+
+// If a registry has an `url`, then that takes precedence over the `host` which may or may
+// not be defined.
+interface HasUrl {
+  url: string;
+  host?: string;
+}
+
+// If a registry does not have an `url`, then it must have a `host`.
+interface WithoutUrl {
+  url: undefined;
+  host: string;
+}
+
+/**
+ * A valid `Registry` value must either have a `url` or a `host` value. If it has a `url` value,
+ * then that takes precedence over the `host` value. If there is no `url` value, then it must
+ * have a `host` value.
+ */
+export type Address = HasUrl | WithoutUrl;
+
+/** Gets the address as a string. This will either be the `url` if present, or the `host` if not. */
+export function getAddressString(address: Address): string {
+  if (address.url === undefined) {
+    return address.host;
+  } else {
+    return address.url;
+  }
+}
+
+export interface ProxyInfo {
+  host: string;
+  port: number;
+  cert: string;
+  registries: Registry[];
+}
--- a/start-proxy/action.yml
+++ b/start-proxy/action.yml
@@ -29,6 +29,6 @@ outputs:
  proxy_urls:
    description: A stringified JSON array of objects containing the types and URLs of the configured registries.
 runs:
-  using: node24
+  using: node20
  main: "../lib/start-proxy-action.js"
  post: "../lib/start-proxy-action-post.js"
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -19,8 +19,8 @@
    "alwaysStrict": true,                     /* Parse in strict mode and emit "use strict" for each source file. */

    /* Additional Checks */
-    "noUnusedLocals": true,                   /* Report errors on unused locals. */
-    "noUnusedParameters": true,               /* Report errors on unused parameters. */
+    "noUnusedLocals": false,                   /* Report errors on unused locals. */
+    "noUnusedParameters": false,               /* Report errors on unused parameters. */
    "noImplicitReturns": true,                /* Report error when not all code paths in function return a value. */
    "noFallthroughCasesInSwitch": true,       /* Report errors for fallthrough cases in switch statement. */

--- a/upload-sarif/action.yml
+++ b/upload-sarif/action.yml
@@ -41,6 +41,6 @@ outputs:

      { "code-scanning": "some-id", "code-quality": "some-other-id" }
 runs:
-  using: node24
+  using: node20
  main: '../lib/upload-sarif-action.js'
  post: '../lib/upload-sarif-action-post.js'