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Pin GitHub Actions to full-length commit SHAs - #1012
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Johannes Schindelin (dscho) merged 2 commits intoOct 22, 2026
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Microsoft Git inherits GitHub workflows from upstreams that use non-pinned versions for convenience. For compliance reasons, Microsoft Git must pin those to SHA-1s. Here is a script that exchanges the moving tags/refs in the `uses:` statements with their fixed SHA-1s. Assisted-by: GPT-6.1 Sol Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Microsoft Git inherits workflows that upstream maintains using symbolic Action refs. Downstream organizational policy requires full commit IDs instead, adding pin maintenance to this project's maintainers' workload. Keep pins aligned with the original upstream Action refs in a fresh downstream snapshot, independent of any earlier pinning commit. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Johannes Schindelin (dscho)
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October 19, 2026 13:16
Johannes Schindelin (dscho)
enabled auto-merge
October 19, 2026 13:16
Matthew John Cheetham (mjcheetham)
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Oct 22, 2026
Johannes Schindelin (dscho)
merged commit Oct 22, 2026
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This PR pins GitHub Actions to full-length commit SHAs in the hopes to improve security and reproducibility. This work is described in more detail at https://aka.ms/action-pinning.
Pinning actions to commit SHAs prevents supply-chain attacks where a tag could be moved to point to malicious code. This is a recommended security best practice per the GitHub Actions security hardening guide.
This change mitigates the risk of tag retargeting to malicious code as seen in incidents like the tj-actions/changed-files action
compromise or codfish/semantic-release-action compromise and improves the integrity and reproducibility of the CI/CD pipeline.
Third-party action references in
.github/workflows/that used mutable tag-based references (e.g.,actions/checkout@v4) have been updated to full-length commit SHAs with a version comment (e.g.,actions/checkout@<sha> # v4) using the pinact tool. References that were already pinned to a SHA, or that used immutable release tags, were left unchanged.