PT-2025-41596

Name of the Vulnerable Software and Affected Versions Authlib versions prior to 1.6.5 Description Authlib, a Python library for building OAuth and OpenID Connect servers, has an issue in its JOSE implementation. It accepts JWS/JWT header and signature segments without size limits. An attacker can...

Linux Distros Unpatched Vulnerability : CVE-2025-59420

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, Authlib's JWS verification accepts tokens that declare unknow...

CVE-2025-59420

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, 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...

DEBIAN-CVE-2025-59420

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, 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...

UBUNTU-CVE-2025-59420

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, 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...

CVE-2025-59420 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, 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...

CVE-2025-59420

Authlib (Python) prior to 1.6.4 verifies JWS tokens with unknown critical header parameters (crit), violating RFC 7515 must-understand semantics. An attacker could craft a signed token that strict verifiers reject but Authlib accepts, enabling policy bypass, replay, or privilege escalation in mix...

CVE-2025-59420 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, 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...

CVE-2025-59420

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, 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...

CVE-2025-59420 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, 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...

Incorrect Authorization

Overview authlib is a library in building OAuth and OpenID Connect servers. Affected versions of this package are vulnerable to Incorrect Authorization via the deserializecompact function. An attacker can bypass intended authorization policies by crafting a signed token with unknown critical head...

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...

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...

Authlib 安全漏洞

Authlib is the ultimate Python library for building OAuth and OpenID Connect servers open-sourced by Authlib. A security vulnerability exists in Authlib versions prior to 1.6.4, which stems from JWS authentication accepting tokens declaring unknown key header parameters, which could lead to polic...

CVE-2025-59420: Insufficient Verification of Data Authenticity

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, 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...

Linux Distros Unpatched Vulnerability : CVE-2021-28374

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - The Debian courier-authlib package before 0.71.1-2 for Courier Authentication Library creates a /run/courier/authdaemon directory with weak permissions, allowin...

TencentOS Server 4: python-authlib (TSSA-2024:1134)

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2024:1134 advisory. Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:...

CVE-2021-43777

Redash is a package for data visualization and sharing. In Redash version 10.0 and prior, the implementation of Google Login via OAuth incorrectly uses the state parameter to pass the next URL to redirect the user to after login. The state parameter should be used for a Cross-Site Request Forgery...

Linux Distros Unpatched Vulnerability : CVE-2024-37568

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - lepture Authlib before 1.3.1 has algorithm confusion with asymmetric public keys. Unless an algorithm is specified in a jwt.decode call, HMAC verification is...