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PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

🗓️ 24 Jul 2026 08:01:50Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 5 Views

PyJWT accepts public-key json web key as HMAC secret, enabling forged tokens when mixed families are allowed.

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07 Aug 2026 21:48Current
5.2Medium risk
Vulners AI Score5.2
CVSS 3.17.4
EPSS0.00395
SSVC
5