Authlib: empty signatures validation in JWS JSON deserialization

影響: pip:authlib <= 1.8.0 → 1.9.0

Authlib (prior to 1.9.0) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key. Root cause authlib/jose/rfc7515/jws.py, read on the installed 1.8.0 artifact: python is_valid = True # set before anything is checked for header_obj in obj["signatures"]: # empty array means the body never…

GitHub Advisory Databaseで読む

2026/10/27 23:50、GitHub Advisory Databaseが「Authlib: empty signatures validation in JWS JSON deserialization」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「緊急」(critical) です。関連する技術: Python。CVE: CVE-2026-96760。