Pin GitHub Actions to full-length commit SHAs - #5353
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Timothee Guerin (timotheeguerin) merged 1 commit intoAug 31, 2026
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Go emitter diffBaseline No changes to generated output. Rendered diff: inline on the run summary, or the emitter-diff-go-html artifact. Informational check (core/eng/emitter-diff); does not block the PR. |
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📦 Package size report✅ No notable package size changes compared to the base branch. 13 package(s) with no notable change
Packed = gzipped |
Timothee Guerin (timotheeguerin)
marked this pull request as ready for review
August 31, 2026 16:29
Timothee Guerin (timotheeguerin)
requested review from
Mark Cowlishaw (markcowl) and
Jeff Fisher (xirzec)
as code owners
August 31, 2026 16:30
Timothee Guerin (timotheeguerin)
enabled auto-merge
August 31, 2026 16:30
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iscai-msft
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Aug 31, 2026
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Every third-party action in our workflows was referenced by a mutable tag (
actions/checkout@v7). Tags can be retargeted, so a compromised upstream repo silently gets write access to our CI — exactly what happened in the tj-actions/changed-files and codfish/semantic-release-action compromises.Every action is now pinned to a full-length commit SHA, with the version kept as a comment so it stays readable and Dependabot can keep bumping it:
Dependabot also gets a 7 day cooldown on the
github-actionsecosystem, giving the community a window to spot a compromised release before we auto-adopt it.The SHAs resolve to the same commits the tags pointed at, so there is no behavioral change. Generated
*.lock.ymlagentic workflows are untouched —gh-awalready emits pinned SHAs there.Redo of #5341, which went stale with conflicts. See https://aka.ms/action-pinning.