EUVD-2026-19911
GHSA-fjrm-76x2-c4q4
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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3Description
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.
Analysis
Memory exhaustion in JWCrypto before 1.5.7 allows unauthenticated remote attackers to cause denial of service on memory-constrained systems by sending crafted JWE tokens with ZIP compression that decompress to approximately 100MB despite remaining under the 250KB input size limit. The vulnerability exploits incomplete validation in the upstream CVE-2024-28102 patch, which restricted input token size but failed to enforce decompressed output limits.
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