HIGH 8.3 NVD
CVE-2026-53507
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 act
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.
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-fhj3-7267-7vv5
This high severity vulnerability with a CVSS score of 8.3 was published on 2026-08-31 via NVD.
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