Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

SummaryAuthlib’s JWS verification accepts tokens that declare unknown critical header parameters crit, violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical header for example, bork or cnf that strict verifiers reject but Authlib accepts. In...

EUVD-2025-30790

Malicious code in bioql PyPI...

GHSA-9GGR-2464-2J32 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Summary Authlib’s JWS verification accepts tokens that declare unknown critical header parameters crit, violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical header for example, bork or cnf that strict verifiers reject but Authlib accepts. In...

PT-2025-38752

Name of the Vulnerable Software and Affected Versions Authlib versions prior to 1.6.4 Description Authlib’s JWS verification improperly handles tokens declaring unknown critical header parameters crit, violating RFC 7515 specifications. An attacker can create a signed token with a critical header...