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PYSEC-2026-287 Authlib JWS JWK Header Injection: Signature Verification Bypass

🗓️ 29 Jun 2026 11:50:45Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 4 Views

Authlib JWS allows forging tokens via attacker-controlled json web key header when key=None, bypassing verification.

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01 Jul 2026 20:22Current
7.4High risk
Vulners AI Score7.4
CVSS 3.19.1
EPSS0.00548
4