Security: pin GitHub Actions to prevent supply chain attacks#35
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allie-fowler wants to merge 1 commit intomasterfrom
Open
Security: pin GitHub Actions to prevent supply chain attacks#35allie-fowler wants to merge 1 commit intomasterfrom
allie-fowler wants to merge 1 commit intomasterfrom
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Updates all action references in the README workflow to use pinned versions instead of branch references (@master). Background: In March 2025, the tj-actions/changed-files supply chain attack demonstrated that referencing actions by mutable branch or tag names is dangerous. Attackers who compromise an action repo can rewrite a tag or push to a branch, and every downstream workflow silently runs the attacker's code with access to the repo's secrets. See: https://www.stepsecurity.io/blog/hackerbot-claw-github-actions-exploitation Changes: - actions/checkout: @master -> @v6 (GitHub-owned, major version tag) - rlespinasse/github-slug-action: @v2.x -> @<sha> (v5, SHA-pinned) - ad-m/github-push-action: @master -> @<sha> (v1.0.0, SHA-pinned) GitHub-owned actions (actions/*) use major version tags since GitHub controls those repos and follows semver. Third-party actions are SHA-pinned because any individual maintainer account could be compromised, and a SHA is immutable.
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Summary
Updates all action references in the README workflow from mutable branch
references (
@master) to pinned versions, mitigating supply chain attacks.Why this matters
In March 2025, the tj-actions/changed-files supply chain attack demonstrated that referencing actions by mutable branch or tag names is dangerous. Attackers who compromise an action repo can rewrite a tag or push to a branch, and every downstream workflow silently runs the attacker's code with full access to the repo's secrets.
This repo is public, meaning its workflow files are visible to anyone researching targets.
Changes
actions/checkout@master@v6rlespinasse/github-slug-action@v2.x@9e7def6...(v5)ad-m/github-push-action@master@77c5b41...(v1.0.0)GitHub-owned actions (
actions/*) use major version tags since GitHub controls those repos. Third-party actions are SHA-pinned because any individual maintainer's account could be compromised.Test plan
createtrigger still fires and updates the README on new branches