chore: pin GitHub Actions to commit SHAs#207
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gregorydemay
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May 11, 2026
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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@v3->actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0actions/cache@v3->actions/cache@6f8efc29b200d32929f49075959781ed54ec270c # v3.5.0Files modified
.github/workflows/ci.yml