Incorrect Behavior Order: Early Amplification Affecting python3-jwt+crypto package, versions <0:2.4.0-1.amzn2023.0.6


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.43% (37th percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHON3JWTCRYPTO-21702966
  • published25 Oct 2026
  • disclosed28 Sept 2026

Introduced: 28 Sep 2026

CVE-2026-101917  (opens in a new tab)
CWE-408  (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. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.

CVSS Base Scores

version 3.1