{"id":"CVE-2026-102273","revision":"90d9829bf6e347539d39d871ed2cdca4","records":[{"revision":"90d9829bf6e347539d39d871ed2cdca4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102273","aliases":[],"title":"PyJWT accepts public JWK containers as HMAC secrets","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. This occurs when an application allows HMAC and asymmetric algorithms and passes a public JWK container as the raw key. As a result, public asymmetric key material is accepted as the HMAC secret. Consequently, an attacker who knows the public key can forge a token with arbitrary authenticated claims. This issue is fixed in version 2.14.0.","state":0,"publishedAt":"2026-09-28T20:38:28.161+00:00","modifiedAt":"2026-09-29T13:44:49.2+00:00","affected":[{"ecosystem":"Vendor product","name":"pyjwt","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jpadilla\",\n                    \"product\": \"pyjwt\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.13.0, < 2.14.0\",\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:H/I:H/A:N","score":7.4,"severity":"HIGH"}],"references":["https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w2cx-738m-mc7w","https://github.com/jpadilla/pyjwt/commit/801cd128528c62d9b23fcd161d1a2e1c17982f95","https://github.com/jpadilla/pyjwt/releases/tag/2.14.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102273","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102273","identifiers":["CVE-2026-102273"]},"retained":false,"historicalAffected":[]}],"coverage":[]}