Allocation of Resources Without Limits or Throttling Affecting python3-jwcrypto package, versions <0:1.4.2-46.amzn2023.0.1


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.29% (22nd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-AMZN2023-PYTHON3JWCRYPTO-16348697
  • published3 May 2026
  • disclosed7 Apr 2026

Introduced: 7 Apr 2026

CVE-2026-39373  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3-jwcrypto to version 0:1.4.2-46.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-1590.

NVD Description

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

JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing patch for CVE-2024-28102 limits input token size to 250KB but does not validate the decompressed output size. An unauthenticated attacker can cause memory exhaustion on memory-constrained systems. A token under the 250KB input limit can decompress to approximately 100MB. This vulnerability is fixed in 1.5.7.

CVSS Base Scores

version 3.1