MEDIUM5.3
PYSEC-2026-70
Quick fix
PYSEC-2026-70 — jwcrypto: upgrade to the fixed version with the command below.
pip install --upgrade 'jwcrypto>=1.5.7'Details
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.
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