ci: declare workflow-level contents: read on 6 test/lint workflows#2955
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soutaro merged 1 commit intoMay 18, 2026
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Pins the default GITHUB_TOKEN to contents: read on the 6 workflows in .github/workflows/ that don't actually need any write scope: - c-check.yml: C-extension build check. - milestone.yml: PR milestone enforcer. The github-script step only reads context.payload.pull_request and calls core.setFailed / core.info; no github.rest.* API call. - ruby.yml: Ruby test matrix. - rust.yml: Rust parser build. - typecheck.yml: steep typecheck. - windows.yml: Windows test job. bundle-update.yml and comments.yml are intentionally left implicit: - bundle-update.yml does git push, gh pr create, gh pr merge --auto. - comments.yml needs comment-write scope. Motivation: CVE-2025-30066 (March 2025 tj-actions/changed-files compromise) exfiltrated GITHUB_TOKEN from workflow logs. Per-workflow caps bound runtime authority irrespective of repo or org default, give drift protection if the default ever widens, and are credited per-file by the OpenSSF Scorecard Token-Permissions check. YAML validated locally with yaml.safe_load. Signed-off-by: Arpit Jain <arpitjain099@gmail.com>
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Pins the default
GITHUB_TOKENtocontents: readon the 6 workflows in.github/workflows/that don't actually need any write scope:c-check.yml: C-extension build check.milestone.yml: PR milestone enforcer. Theactions/github-scriptstep only readscontext.payload.pull_requestand callscore.setFailed/core.info; nogithub.rest.*API call.ruby.yml: Ruby test matrix.rust.yml: Rust parser build.typecheck.yml: steep typecheck.windows.yml: Windows test job.Left implicit on purpose:
bundle-update.ymldoesgit push,gh pr create, andgh pr merge --auto.comments.ymlneeds comment-write scope.Both need write scopes that are best declared by a maintainer.
Why
CVE-2025-30066 (March 2025
tj-actions/changed-filessupply-chain compromise) exfiltratedGITHUB_TOKENfrom workflow logs and the leaked token retained whatever scope was issued at the workflow level. Pinning per workflow caps that runtime authority irrespective of the repo or org default, gives drift protection if the default ever widens, and is credited per-file by the OpenSSF ScorecardToken-Permissionscheck.YAML validated locally with
yaml.safe_loadon each touched file.