ghsa:GHSA-PXH4-856F-4H89: pyjwt <= 2.13.0

PyJWT: HS256/384/512 verify accepts empty HMAC key via oct JWK (PyJWK/PyJWKClient) enabling token forgery. Affected range: <= 2.13.0. Fixed version: 2.14.0.

Affected technology

pyjwt · <= 2.13.0
Vendor not specified by the source

Component: Not specified by the source

Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Source advisory’s CVSS 3.1 assessment rates confidentiality and integrity impact as high; availability impact as none. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 22-Oct-2026 20:58 UTC

Product: pyjwt
KEV: no

Provenance

GitHub Advisory Database · Source record · observed 2026-10-22 20:55:42.144132+00:00 UTC

Stable permalink: https://cybercodered.org/item/adv-ghsa-ghsa-pxh4-856f-4h89.html