CVE-2026-39373

MEDIUM

5.3

Description

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/7/2026

Last Modified4/15/2026

Sourcenvd

Honeypot Sightings0

Affected Products

latchset:jwcrypto

Weaknesses (CWE)

CWE-409

References

https://github.com/latchset/jwcrypto/security/advisories/GHSA-fjrm-76x2-c4q4(security-advisories@github.com)

IOC Correlations

No correlations recorded

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