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🛡️ Sentinel: Fix moving and non-existent version tags in GitHub Actions workflows #129

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🛡️ Sentinel: Fix moving and non-existent version tags in GitHub Actions workflows #129

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4 changes: 2 additions & 2 deletions .github/workflows/check.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -14,8 +14,8 @@ jobs:
- "3.13"
- "3.12"
steps:
- uses: actions/checkout@v7
- uses: jdx/mise-action@v4
- uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
- uses: jdx/mise-action@7e36c90d9ab29c415a2384db3006f3ec8a8cc654 # v4.2.4
with:
tool_versions: |
python ${{ matrix.python-version }}
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4 changes: 2 additions & 2 deletions .github/workflows/docs.yml
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Expand Up @@ -10,8 +10,8 @@ jobs:
deploy:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v7
- uses: jdx/mise-action@v4
- uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
- uses: jdx/mise-action@7e36c90d9ab29c415a2384db3006f3ec8a8cc654 # v4.2.4
- name: Configure Git Credentials
run: |
git config user.name github-actions[bot]
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5 changes: 5 additions & 0 deletions .jules/sentinel.md
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@@ -1,3 +1,8 @@
# Sentinel Security Journal

This journal contains critical security learnings specific to this project.

## 2026-03-10 - Secure GitHub Actions Pinned to Immutable SHAs
**Vulnerability:** Workflows were referencing a non-existent version tag `actions/checkout@v7` and a mutable major version tag `jdx/mise-action@v4`. Using non-existent or moving tags exposes the repository to supply chain and tag-spoofing attacks if an attacker registers or hijacks the version tag.
**Learning:** Third-party actions should not rely on moving major version tags or non-existent tags. Moving tags are mutable, and their associated commits can change, potentially introducing untested or malicious code.
**Prevention:** Pin all third-party GitHub Actions to secure, immutable 40-character full-length commit SHAs, and append a comment indicating the human-readable version (e.g. `# v4.4.0`). Dependabot can then be configured to automatically update these SHAs.
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