CVE-2026-28802

Published March 6th, 2026

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CVSS v3

9.8

CRITICAL

CVSS v2

N/A

Affected

PROJECT

Description

Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.

authlib/authlib

The ultimate Python library in building OAuth, OpenID Connect clients and servers. JWS, JWE, JWK, JWA, JWT included.

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