CVE-2026-96760
Authlib library contains a signature‑verification bypass vulnerability
- Published
- Sep 28, 2026
- Updated
- Oct 1, 2026
- Assigning CNA
- certcc
- Evidence observed
- Nov 4, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 37.7%
- Model date
- Nov 4, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
Authlib 1.7.2: Signature Verification Bypass - General JSON JWS Accepts Unsigned Payload when `signatures` is Empty
Responsible use
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