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Improper Verification of Cryptographic Signature Affecting py3.12-pyjwt package, versions <2.14.0-r0

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.2% (9th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-PY312PYJWT-20343923
  • published1 Oct 2026
  • disclosed28 Sept 2026
Report a new vulnerability Found a mistake?

Introduced: 28 Sep 2026

NewCVE-2026-102268  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade Minimos:latest py3.12-pyjwt to version 2.14.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream py3.12-pyjwt package and not the py3.12-pyjwt package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.