Denial Of Service (DoS)

authlib is vulnerable to Denial Of Service. The vulnerability is due to unbounded DEFLATE decompression in the JWE zip=DEF processing path, where a very small ciphertext can expand into extremely large plaintext during token decryption, and attackers can exploit this by supplying decryptable toke...

EUVD-2025-33799

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable...

CVE-2025-62706 Authlib : JWE zip=DEF decompression bomb enables DoS

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable...