CVE-2026-96760

Authlib library contains a signature‑verification bypass vulnerability

Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.

Affected

Authlib

CVSS v3.1 CNA

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.28% chance of exploitation in the next 30 days, 19th percentile

Published

2026-09-28

Updated

2026-10-01

Proof-of-concept exploits (1)

• uziii2208/CVE-2026-967600★ · 2026-09-30

Security advisories

• https://kb.cert.org/vuls/id/762428
• https://www.kb.cert.org/vuls/id/762428

References

• CVE Record
• NVD entry

Related

• CVE-2025-33073
• CVE-2026-88899