{"id":"CVE-2026-53508","aliases":["GHSA-2jcc-mxv7-p3f9","GO-2026-5937"],"url":"https://o3.security/vulnerability/CVE-2026-53508","summary":"oasdiff does not enforce --allow-external-refs=false on the git-revision load path (SSRF / local file read)","details":"oasdiff is a command-line and Go package that compares and detects breaking changes in OpenAPI specs. From version 1.13.2 through version 1.18.0, oasdiff did not enforce --allow-external-refs=false (library: openapi3.Loader.IsExternalRefsAllowed = false) when loading a spec from a git revision (the rev:path form, e.g. main:openapi.yaml). External $refs were resolved on that load path even when external refs were explicitly disabled, so the mitigation silently did not apply there. This issue has been patched in version 1.18.1.","published":"2026-08-31T18:52:12.213Z","modified":"2026-09-02T03:47:19.399837651Z","cvss":null,"epss":{"score":0.00288,"percentile":0.21016,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/oasdiff/oasdiff","fixedVersion":"1.18.1"}],"fix":{"url":"https://github.com/oasdiff/oasdiff/pull/832","label":"oasdiff/oasdiff#832"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53508.json"},{"type":"ADVISORY","url":"https://github.com/oasdiff/oasdiff/security/advisories/GHSA-2jcc-mxv7-p3f9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53508"},{"type":"FIX","url":"https://github.com/oasdiff/oasdiff/pull/832"},{"type":"FIX","url":"https://github.com/oasdiff/oasdiff/pull/974"},{"type":"FIX","url":"https://github.com/oasdiff/oasdiff/pull/975"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-02T03:47:19.399837651Z"}}