{"id":"CVE-2026-103001","revision":"e8447f2f94334384bc0bc46be51be4e5","records":[{"revision":"e8447f2f94334384bc0bc46be51be4e5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103001","aliases":[],"title":"PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse","description":"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.","state":0,"publishedAt":"2026-09-30T21:15:12.862+00:00","modifiedAt":"2026-10-05T23:47:32.912+00:00","affected":[{"ecosystem":"Vendor product","name":"pyjwt","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jpadilla\",\n                    \"product\": \"pyjwt\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.11.0, <= 2.13.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q","https://github.com/jpadilla/pyjwt/issues/679","https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103001","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103001","identifiers":["CVE-2026-103001"]},"retained":false,"historicalAffected":[]}],"coverage":[]}