GitHub Actions is Vulnerable to Supply Chain Attacks

GitHub Actions workflows can face software supply-chain risks because many third-party actions are referenced through mutable tags such as `actions/checkout@v3`, allowing upstream changes, including malicious or breaking ones, to affect future builds automatically. Although actions can be pinned to an immutable commit hash, GitHub Actions lacks a built-in mechanism for easily updating those locked dependencies, creating a tradeoff between protection from unexpected upstream changes and exposure to outdated actions missing security fixes. The proposed solution is syntax that combines a human-readable mutable version reference with a fixed commit revision, enabling workflows to remain reproducible while supporting straightforward dependency updates. The author notes that RWX, a CI/CD platform under development, intends to avoid this design issue.

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