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What a full-length SHA pin does
A GitHub Actions reference has two parts: the repository and the ref after @. In owner/repository@v4, v4 is normally a tag. In owner/repository@main, main is a branch. Both names can resolve to different commits over time. A full-length commit SHA identifies one commit directly.
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GitHub’s Secure use reference states: “Pinning an action to a full-length commit SHA is currently the only way to use an action as an immutable release.” Once a workflow contains the selected SHA, a later movement, replacement, or deletion of a tag does not silently select a different commit for that workflow run.
Use the complete 40-character hexadecimal SHA. GitHub specifically advises against abbreviated SHAs because a shortened value is less precise and can become ambiguous as a repository grows.
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Tags, branches and SHAs compared
| Reference | What the workflow follows | What happens when upstream changes | Maintenance burden |
|---|---|---|---|
Version tag, such as v4 |
The commit currently named by that tag | A maintainer can move or delete the tag; future runs can receive different code | Low at first, but changes can arrive without a pull request in your repository |
Branch, such as main |
The branch tip at run time | Every new commit on the branch can change what your workflow executes | Low maintenance, highest change rate |
| Full commit SHA | One exact commit | Upstream changes do not enter your runs until you change the SHA | Requires review and intentional updates |
Tags are convenient for experimentation and internal code, but they are not an immutable security boundary. Branch references are useful when you explicitly want the latest development code. For third-party actions and reusable workflows that can read repository data or receive tokens, a reviewed full SHA is the safer default.
Choose the commit you actually intend to run
Pinning is a selection decision, not a search for any commit that happens to work. Start with the action’s own GitHub repository, identify the release or tag your team has approved, and locate the commit that tag denotes. Do not copy a SHA from an unrelated fork, a blog post, or a sample that may have become stale.
Review the release and source
- Open the action’s canonical repository, not a fork with a similar name.
- Find the release or tag you intend to use. Record the release’s documented behavior, permissions, and breaking-change notes.
- Open the tag’s commit and copy its complete 40-character SHA. For an annotated tag, make sure you use the commit the tag ultimately resolves to, rather than an abbreviated display value.
- Review the source at that commit. Check scripts, downloaded binaries, shell commands, network access, and changes to the action’s required permissions.
- Confirm that the repository owner and path match the action reference in your workflow. A valid SHA from a fork is still the wrong dependency.
The SHA fixes which snapshot GitHub fetches; it does not certify that snapshot. A compromised maintainer account, a vulnerable release, or malicious code can all be pinned successfully. Treat the source review and the workflow’s permissions as separate controls.
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If you prefer a reproducible lookup, Git can list the object associated with a tag. Replace the repository address and tag with the action you have approved:
git ls-remote https://github.com/OWNER/REPOSITORY.git
refs/tags/RELEASE_TAG refs/tags/RELEASE_TAG^{}The output contains hexadecimal object IDs followed by the requested refs. When the tag is annotated, the line ending in ^{} dereferences it to the commit that the workflow should execute. Compare the resulting full SHA with the commit shown in the action’s own repository before editing YAML. Keep a record of the tag, SHA, review date, and reviewer in your normal dependency process.
Replace the mutable reference in workflow YAML
The conceptual change is small. The text after @ changes from a tag or branch to the selected full SHA. A same-line comment can preserve the human-readable release:
# Before: the tag can be moved by its owner
- uses: owner/repository@v4
# After: COMMIT_SHA means the reviewed 40-character commit
- uses: owner/repository@COMMIT_SHA # v4.2.2COMMIT_SHA in this example is a template token for the actual 40-character hexadecimal value; it is not valid YAML input until replaced. Keep the comment on the same line as the reference. The comment helps reviewers and dependency tooling understand which release the commit was intended to represent, while the SHA remains the value that selects code.
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Do not shorten the value, add punctuation to it, or put the tag in place of the SHA. Preserve the repository owner and name exactly as shown in the action’s official repository.
Pin every action in the job
A workflow can contain several third-party actions. Pin each one independently, including actions in different jobs and steps:
name: build
on:
push:
jobs:
test:
runs-on: ubuntu-latest
steps:
- name: Check out source
uses: actions/checkout@COMMIT_SHA # v4.2.2
- name: Set up runtime
uses: owner/setup-runtime@COMMIT_SHA # v3.1.0
- name: Run tests
run: ./ci/test.shUse the SHA associated with each action’s own approved release. One SHA cannot be copied across unrelated repositories, even if their tags have the same version number.
Pin reusable workflows too
Reusable workflows can run substantial logic with the caller’s context, so apply the same discipline to third-party reusable workflows. Replace a version tag or branch in the uses value with the reviewed full SHA:
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secrets: inheritReview the reusable workflow’s jobs, permissions, inputs, and secret handling at the pinned commit. A reusable workflow can request permissions and invoke other actions, so its dependency chain matters as much as the one-line reference in the caller.
GitHub also documents repository-local reusable-workflow references that resolve from the repository at the commit running the workflow. This repository-local form is not available on GitHub Enterprise Server (GHES). On GHES, use a reference syntax supported by your instance and verify that the selected commit is present there.
Verify the pin before merging
- Search all workflow files under
.github/workflows, including files called by reusable workflows. - Check every external
uses:entry for a complete 40-character hexadecimal SHA. - Compare each SHA with the approved commit in the action’s canonical repository and confirm the release comment, if present, matches your intended version.
- Inspect the pull request diff for accidental changes to permissions, secrets, runner selection, downloaded tools, or scripts alongside the pin.
- Run the workflow on a branch or pull request and confirm that the action starts successfully at the pinned commit.
- Record the dependency, selected release, SHA, source-review result, and next review date.
A local text search can find obvious mutable references, but it cannot establish that a SHA belongs to the correct repository. Repository identity and commit provenance still require a review of the upstream action.
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What pinning does not protect you from
A bad commit remains bad
An immutable reference prevents silent movement; it does not judge the code you selected. If the reviewed release contains a vulnerability or the repository was compromised before you pinned it, the workflow will continue to run that vulnerable code until you update it. Pinning is therefore one layer in a supply-chain program, not a substitute for code review, provenance checks, or vulnerability management.
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Excessive permissions still create exposure
Grant only the permissions a workflow needs. Set an explicit baseline at workflow or job level and add permissions narrowly when a step requires them:
permissions:
contents: read
jobs:
build:
permissions:
contents: read
runs-on: ubuntu-latest
steps:
- uses: owner/repository@COMMIT_SHA # reviewed releaseBe especially cautious with workflows that can access write tokens, pull-request data, deployment credentials, or secrets. A pinned action with unnecessary write access can still damage a repository if its code is malicious or compromised.
Transitive dependencies can change
An action may download packages, call external services, install a tool, or invoke another action. The top-level SHA does not automatically freeze those external resources. Review what the action executes and, where the action supports it, pin or verify its own downloaded dependencies as well.
Build a deliberate update process
Full SHAs do not receive bug fixes or security updates automatically. That is the trade-off for immutability. Assign ownership for action updates and review them on a predictable cadence rather than waiting for a workflow failure.
Use Dependabot version updates
GitHub’s Dependabot documentation supports the github-actions ecosystem. A minimal configuration is:
version: 2
updates:
- package-ecosystem: github-actions
directory: "/"
schedule:
interval: weeklyPlace this configuration in .github/dependabot.yml. Dependabot can open pull requests that update action references; your team must still inspect the proposed commit, release notes, permissions, and source before merging. Set the interval to match your risk tolerance and review capacity. Weekly checks are an example, not a requirement.
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Keep the release comment current when accepting an update. The SHA is authoritative for execution, while the comment tells a human which release was reviewed. If a chosen commit is not associated with a tag, GitHub notes that Dependabot may update to the latest commit, which can differ from the latest published release. Check the proposed target instead of assuming that a version-looking comment guarantees release alignment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Understand the Dependabot alert limitation
Dependabot has separate vulnerability-alert and version-update features. GitHub’s secure-use guidance says vulnerability alerts are created for vulnerable actions referenced with semantic versions, not for actions pinned to SHA values. A SHA pin therefore should not be treated as a vulnerability scanner or as proof that Dependabot will warn about a vulnerable action.
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Enforce full-SHA policy where appropriate
In an announcement dated August 15, 2025, GitHub described an allowed-actions policy setting that checks whether action references use a full commit SHA. When enabled, unpinned action use can cause a workflow to fail. This is useful for organizations that need a repository-wide rule rather than relying on every author to remember the convention.
Policy scope, account-plan availability, and the administration interface can change. Before rollout, verify the current GitHub product documentation and the settings available to your organization. Start with an audit or pull-request check if your team needs time to convert existing workflows, then enforce the rule once all approved exceptions are documented.
Decide how the policy should handle first-party actions, internal actions, local actions, and reusable workflows. A blanket rule without an exception process can block legitimate deployments; an exception process without ownership can become a permanent bypass.
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Optional lockfile tooling: treat preview software as preview software
GitHub’s gh-actions-lock extension can generate and verify a workflow dependency lockfile. It is optional, not a prerequisite for SHA pinning. The project currently labels itself a technical preview, warns that behavior may change before a stable release, and states that GHES is unsupported.
Use it only after checking its current documentation, command behavior, and compatibility with your repositories. Keep the ordinary YAML SHA references understandable even if you adopt a lockfile, and do not make a preview extension your only recovery path. Teams on GHES or in restricted networks should validate support before introducing it.
GHES and air-gapped deployment checks
A SHA copied from GitHub.com may not exist in the actions organization of a GHES instance. GitHub Learn warns that a commit available on GitHub.com can be absent from the GHES installation. Before merging a pin for GHES, confirm that the action repository and selected commit are mirrored or otherwise available to the instance, and test the workflow on that installation.
For an air-gapped environment, document how action content is synchronized, how often mirrors are refreshed, and who approves a commit when the upstream release is unavailable. A syntactically correct SHA is not deployable if the runner cannot fetch its repository.
Troubleshoot common failures
The workflow says the action cannot be found
- Check for a copied or truncated SHA; it must contain all 40 hexadecimal characters.
- Confirm the owner and repository path have not changed.
- Verify that the commit exists in the repository visible to your GitHub.com or GHES environment.
- For a private action, confirm that the workflow’s token and organization policy permit access.
The comment and commit do not match
Open the tag or release in the canonical repository and compare its resolved commit with the SHA in YAML. Correct either the SHA or the comment. Never change the SHA merely to make a comment look right without reviewing the replacement commit.
Dependabot opens an unexpected update
- Inspect whether the current SHA is tagged. An untagged commit can be compared with the latest commit rather than the latest release.
- Read the proposed action release notes and review the complete diff.
- Confirm that the update preserves required inputs, outputs, permissions, and runner compatibility.
- Merge only after a reviewer verifies the new commit in the action’s own repository.
A new security fix is announced upstream
Find the fixed release’s commit, review the changes and permissions, update the SHA in a pull request, and run the affected workflows. Do not wait for a mutable tag to move; a pinned workflow will continue using the old commit until you make this change.
Repository rollout checklist
- Inventory every external action and reusable workflow, including nested or shared workflow files.
- Replace tags and branches with verified full 40-character commit SHAs.
- Add same-line release comments for human review and dependency tooling.
- Confirm every SHA belongs to the intended upstream repository, not a fork.
- Review action source and minimize
GITHUB_TOKENpermissions and secret exposure. - Configure Dependabot’s
github-actionsecosystem and assign pull-request reviewers. - Document how urgent security updates are handled between scheduled update windows.
- Test availability on GHES or in an air-gapped mirror before deployment.
- Evaluate allowed-actions full-SHA enforcement against your current GitHub plan and policy scope.
- If using
gh-actions-lock, record that it is preview software and retain a supported manual workflow.
When a tag or branch is still reasonable
Not every reference has the same risk. A branch may be appropriate for a disposable experiment where tracking upstream continuously is the point. A tag can be acceptable for a low-risk internal workflow when the repository owner, threat model, and change controls are trusted. For production automation, deployment pipelines, privileged jobs, and third-party code, the additional review work of a full SHA is usually justified.
Make the choice explicit in your repository standards. If an exception permits a tag or branch, document the owner, reason, scope, and expiration date. Otherwise, future contributors may interpret an exception as a general endorsement of mutable references.
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