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.

Contact

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