CVE-2026-102273

High

Description

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. This occurs when an application allows HMAC and asymmetric algorithms and passes a public JWK container as the raw key. As a result, public asymmetric key material is accepted as the HMAC secret. Consequently, an attacker who knows the public key can forge a token with arbitrary authenticated claims. This issue is fixed in version 2.14.0.

SeverityHigh

CVSS7.4

Exploit probability—

ProductPyjwt

PublishedSep 28, 2026

First seenSep 28, 2026

Weakness typeCWE-347CWE-347

How to fix

Update

pyjwt2.14.0 or later

Affected products

Product	Affected versions	Fixed in
pyjwt_project pyjwt	2.13.0	—
pyjwtPyPI	2.13.0 ≤ v < 2.14.0	2.14.0

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