CVE-2026-96760: Authlib library contains a signature‑verification bypass vulnerability
Published Sep 28, 2026
·Updated
Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserializejson() 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 Software
1 affected component
pypi/authlib<=1.7.2
Event History
Sep 28, 2026
CVE Published
via MITRE·07:37 PM
Data Sourced
via MITRE·07:37 PM
DescriptionWeakness
Data Sourced
via NVD·08:17 PM
Description
Frequently Asked Questions
1
Which Authlib versions are affected?
Authlib version 1.7.2 and earlier are affected.
2
What conditions are required for exploitation?
An application must process attacker-controlled JSON Serialization JWS input through JsonWebSignature.deserialize_json(). The method can return the payload as verified even when no signature is checked and no cryptographic key is required.