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GHSA-XGMM-8J9V-C9WX PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

🗓️ 15 Jun 2026 19:28:06Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 7 Views

Public-key json web key can be used as an HMAC secret when a verifier supports HS256 and RS256, enabling forged tokens.

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16 Jun 2026 15:44Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.17.4
EPSS0.00394
7