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CVE Watch24 jul 2026

CVE-2026-39373

JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust serv

CVSS

5.3

Medio

EPSS

0.3%

p22

KEV

—

Exploit Today

7

0-100

Publicado: 7 abr 2026 · Última mod.: 24 jul 2026 · CWE-409

EPSS · 30d
0.3%EPSS · 30 días0.3%
2026-08-102026-09-07
Descripción técnica

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.

Referencias oficiales
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