{"id":"CVE-2026-103001","summary":"PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse","details":"PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT's PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected.","aliases":["GHSA-gvp8-978c-rx2q"],"modified":"2026-10-01T11:45:37.860854593Z","published":"2026-09-30T21:15:12.862Z","database_specific":{"cwe_ids":["CWE-471"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103001.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103001.json"},{"type":"FIX","url":"https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35"},{"type":"REPORT","url":"https://github.com/jpadilla/pyjwt/issues/679"},{"type":"ADVISORY","url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103001"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/jpadilla/pyjwt","events":[{"introduced":"697344d25990641b8b2aa85f0a60634b590b5702"},{"last_affected":"7144e4534c34810f4525dc4578a32addd8212cff"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"2.11.0"},{"last_affected":"2.13.0"}]}}],"versions":["2.13.0","2.12.1","2.12.0","2.11.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103001.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N"}]}