chore: pin GitHub Actions to commit SHAs - #15
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fspreiss
approved these changes
Apr 10, 2026
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@slawomirbabicz, I approved all your Action pin PRs. Are you merging them yourselves, or would you like me to do it? |
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Pin GitHub Actions to commit SHAs
GitHub Actions referenced by tag (e.g.
actions/checkout@v4) use a mutable pointer — the tag owner can move it to a different commit at any time, including a malicious one. This is the attack vector used in the tj-actions/changed-files incident (CVE-2025-30066).Pinning to a full 40-character commit SHA makes the reference immutable. The
# tagcomment preserves human readability so reviewers can tell which version is pinned.Important: a SHA can also originate from a forked repository. A malicious actor can fork an action, push a compromised commit to the fork, and the SHA will resolve — but it won't exist in the upstream canonical repo. Each SHA in this PR was verified against the action's canonical repository (not a fork).
Changes
actions/checkout@v1->actions/checkout@50fbc622fc4ef5163becd7fab6573eac35f8462e # v1.2.0Files modified
.github/workflows/chainkeys-testing-canister.yml