Unpinned actions full length commit SHA
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Id: 555ab8f9-2001-455e-a077-f2d0f41e2fb9
Cloud Provider: GitHub
Platform: CICD
Severity: Low
Category: Supply-Chain
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Description
Steps that reference external GitHub Actions must be pinned to a full-length commit SHA to ensure the action’s code is immutable and to reduce supply-chain tampering or unexpected behavior from upstream updates. The rule inspects the uses property in step attributes and requires the value to end with @ followed by a 40-character lowercase hexadecimal commit SHA (pattern @[a-f0-9]{40}). Entries that do not match this pattern will be flagged. The check ignores local actions referenced with relative paths, starting with ./, and references beginning with actions/. When pinning, use a commit SHA from the action’s original repository so the pinned reference matches the intended source.
Secure example with a pinned action:
- name: Build and push
uses: docker/build-push-action@e3b0c44298fc1c149afbf4c8996fb92427ae41e4
Compliant Code Examples
name: test-positive
on:
pull_request:
types: [opened, synchronize, edited, reopened]
branches:
- master
jobs:
test-positive:
runs-on: ubuntu-latest
steps:
- name: PR comment
uses: thollander/actions-comment-pull-request@b07c7f86be67002023e6cb13f57df3f21cdd3411
with:
comment_tag: title_check
mode: recreate
create_if_not_exists: true
name: test-positive
on:
pull_request:
types: [opened, synchronize, edited, reopened]
branches:
- master
jobs:
test-positive:
runs-on: ubuntu-latest
steps:
- name: Checkout Code
uses: actions/checkout@v4
with:
persist-credentials: false
name: test-negative3
on:
pull_request:
types: [opened, synchronize, edited, reopened]
branches:
- master
jobs:
test-negative3:
runs-on: ubuntu-latest
steps:
- name: Local action
uses: ./test.yml
Non-Compliant Code Examples
name: test-positive
on:
pull_request:
types: [opened, synchronize, edited, reopened]
branches:
- master
jobs:
test-positive:
runs-on: ubuntu-latest
steps:
- name: PR comment
uses: thollander/actions-comment-pull-request@v2
with:
comment_tag: title_check
mode: recreate
create_if_not_exists: true
