The False Security of SHA Pinning in GitHub Actions

The article argues that pinning dependencies to commit SHAs in GitHub Actions—commonly considered a best practice—creates a false sense of security. While SHAs are immutable, GitHub does not verify that a referenced SHA actually belongs to the intended repository. This allows attackers to substitute malicious code from a fork while keeping the same repo name, making changes hard to detect in reviews. The core issue is lack of provenance, not immutability, showing that SHA pinning alone is insufficient without validation and stronger supply chain controls 

https://www.vaines.org/posts/2026-03-24-the-comforting-lie-of-sha-pinning

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