Improper Verification of Cryptographic Signature Affecting python3-jwt+crypto package, versions <0:2.4.0-1.amzn2023.0.6


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.18% (7th percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHON3JWTCRYPTO-21702962
  • published25 Oct 2026
  • disclosed28 Sept 2026

Introduced: 28 Sep 2026

CVE-2026-102273  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3-jwt+crypto to version 0:2.4.0-1.amzn2023.0.6 or higher.
This issue was patched in ALAS2023-2026-3298.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-jwt+crypto package and not the python3-jwt+crypto package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1