Security Advisory

CVE-2026-102272

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-09-28 20:36:31

Last updated 2026-09-29 14:45:44

Assigner GitHub_M

CVSS score 7.4

State PUBLISHED

Description

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON. This occurs when a public JWK is prefixed with a UTF-8 BOM and used in a mixed-algorithm verification path. As a result, public JWK bypasses asymmetric-key detection and becomes the HMAC secret. Consequently, an attacker who knows the public key can forge authenticated tokens. This issue is fixed in version 2.14.0.

← Browse all CVEs View on cve.org ↗