Vulnerability Description
oasdiff-action is a GitHub Action that detects breaking changes in OpenAPI specs and post a review on every pull request. Before version 0.0.51, the oasdiff actions resolved external $refs in the OpenAPI spec by default (allow-external-refs: true). When an action runs on a pull request whose spec is attacker-controlled — most importantly fork pull requests on public repositories — a $ref in that spec is fetched/read on the runner with no interaction required, enabling SSRF and disclosure of structured files on the runner. This issue has been patched in version 0.0.51.
Related Weaknesses (CWE)
References
- https://github.com/oasdiff/oasdiff-action/pull/128
- https://github.com/oasdiff/oasdiff-action/pull/129
- https://github.com/oasdiff/oasdiff-action/pull/130
- https://github.com/oasdiff/oasdiff-action/security/advisories/GHSA-fhj3-7267-7vv
FAQ
What is CVE-2026-53507?
CVE-2026-53507 is a documented vulnerability. oasdiff-action is a GitHub Action that detects breaking changes in OpenAPI specs and post a review on every pull request. Before version 0.0.51, the oasdiff actions resolved external $refs in the Open...
How severe is CVE-2026-53507?
CVSS scoring is not yet available for CVE-2026-53507. Check NVD for updates.
Is there a patch for CVE-2026-53507?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.