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.

Details CVE

Score CVSS v3.15.3

SeveriteMEDIUM

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie4/7/2026

Derniere modification4/15/2026

Sourcenvd

Observations honeypot0

Produits affectes

latchset:jwcrypto

Faiblesses (CWE)

CWE-409

References

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

Correlations IOC

Aucune correlation enregistree

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