JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to version 1.5.6, an attacker can cause a denial of service attack by passing in a malicious JWE Token with a high compression ratio. When the server processes this token, it will consume a lot of memory and processing time. Version 1.5.6 fixes this vulnerability by limiting the maximum token length.

NOTE: https://github.com/latchset/jwcrypto/security/advisories/GHSA-j857-7rvv-vj97
NOTE: https://github.com/latchset/jwcrypto/commit/90477a3b6e73da69740e00b8161f53fea19b831f (v1.5.6)