There are two types of folks: those who pin their dependencies to (often) mutable tags and other pointers, and those who already pin to hash sums.

This is true for GitHub Actions as well. For example, most tags in the tj-actions/changed-files repository were repointed to compromised versions by an attacker, potentially affecting 23,000 repositories until GitHub shut down the entire repository.

Manually pinning dependencies can be tedious, so it's better to utilize tools like Renovate. The SpotOnInc/renovate-config preset does exactly that. Note that you can pin it to a hash sum too, just in case ;)

P.S. If you used that GitHub Action, here is a list of possible mitigation steps: antonbabenko/pre-commit-terraform#837.

#security #github #gha