Improper Handling of Highly Compressed Data (Data Amplification) Affecting python313-jwcrypto package, versions <1.5.6-160000.3.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.43% (35th percentile)

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  • Snyk IDSNYK-SLES1600-PYTHON313JWCRYPTO-16420019
  • published5 May 2026
  • disclosed29 Apr 2026

Introduced: 29 Apr 2026

CVE-2026-39373  (opens in a new tab)
CWE-409  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 python313-jwcrypto to version 1.5.6-160000.3.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python313-jwcrypto package and not the python313-jwcrypto package as distributed by SLES. See How to fix? for SLES:16.0.0 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