{"cve":"CVE-2026-103001","nvd":{"published":"2026-09-30T22:16:33.537","modified":"2026-10-08T13:13:53.857","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-471"],"references":["https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35","https://github.com/jpadilla/pyjwt/issues/679","https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q","https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q"],"products":["pyjwt_project:pyjwt"],"source":"nvd","synced_at":"2026-10-19T22:57:46.668721662+00:00"},"epss":{"cve":"CVE-2026-103001","score":0.00257,"percentile":0.17172,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-gvp8-978c-rx2q","url":"https://osv.dev/vulnerability/GHSA-gvp8-978c-rx2q","summary":"PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse","modified":"2026-10-01T17:55:53.001409325Z","packages":[{"ecosystem":"PyPI","name":"pyjwt","purl":"pkg:pypi/pyjwt","ranges":[">=2.11.0 <=2.13.0"],"fixed":[]}]},{"id":"PYSEC-2026-4146","url":"https://osv.dev/vulnerability/PYSEC-2026-4146","summary":"PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse","modified":"2026-10-01T17:45:16.841846797Z","packages":[{"ecosystem":"PyPI","name":"pyjwt","purl":"pkg:pypi/pyjwt","ranges":[">=2.11.0 <=2.13.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}