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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35 Patch
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q Exploit, Mitigation, Vendor Advisory
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.5 · pyjwt_projectNVD modified 2026-10-08 13:13
Affected (CPE criteria) 1
cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:*
References 4
- https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35 Patch
- https://github.com/jpadilla/pyjwt/issues/679 Exploit, Issue Tracking
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q Exploit, Mitigation, Vendor Advisory
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q Exploit, Mitigation, Vendor Advisory