CVE-2026-53507
oasdiff actions resolve external $refs by default, enabling SSRF and disclosure of structured files on pull-request runs
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-200 CWE-918 CWE-1188 |
| Vendor | oasdiff |
| Product | oasdiff-action |
| Published | Aug 31, 2026 |
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Affected Versions
oasdiff / oasdiff-action
< 0.0.51