Not Failing Securely ('Failing Open')

Overview authlib is a library in building OAuth and OpenID Connect servers. Affected versions of this package are vulnerable to Not Failing Securely 'Failing Open' via the verifyhash function in authlib/oidc/core/claims.py. An attacker can substitute an access token or authorization code undetect...

Improper Verification of Cryptographic Signature

Overview authlib is a library in building OAuth and OpenID Connect servers. Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JsonWebSignature.preparealgorithmkey method in authlib/jose/rfc7515/jws.py. An attacker can bypass authenticatio...

aad-fastapi-dl37 (>=1.0.0 <=1.0.2), agentiq (>=1.2.0a20250730 <=1.2.0rc4) +225 more potentially affected by CVE-2026-27962 via authlib (>=1.0.0 <=1.6.8)

authlib PYPI version =1.0.0, =1.0.0, =1.2.0a20250730, =1.1.0, =1.2.0a20250730, =0.4.0, =0.1.0, =0.5.0, =0.1.0a1, =1.2.0, =1.2.0a20250730, =1.2.0a20250730, =1.2.0a20250730, =1.2.0, =1.2.0a20250730, =1.2.0a20250730, =1.2.0rc4 and more Source cves: CVE-2026-27962 Source advisory:...

CVE-2026-28498

A flaw was found in Authlib, a Python library used for building OAuth and OpenID Connect OIDC servers. This vulnerability allows a remote attacker to bypass critical integrity checks in OIDC ID Tokens. Specifically, the library's internal hash verification logic fails open when encountering an...

CVE-2026-28490

A flaw was found in Authlib, a Python library for building OAuth and OpenID Connect servers. This cryptographic padding oracle vulnerability, affecting the JSON Web Encryption JWE RSA15 key management algorithm, could allow a remote attacker to decrypt sensitive information. The vulnerability...

CVE-2026-27962

A flaw was found in Authlib, a Python library used for creating secure authentication and authorization systems. This vulnerability, known as JWK JSON Web Key Header Injection, affects how Authlib verifies digital signatures in JWS JSON Web Signature tokens. An attacker can exploit this by creati...

CVE-2026-28498

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...

CVE-2026-27962

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any...

CVE-2026-28490

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption JWE RSA15 key management algorithm. Authlib registe...

CVE-2026-28498

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...

UBUNTU-CVE-2026-27962

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any...

CVE-2026-28490

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption JWE RSA15 key management algorithm. Authlib registe...

CVE-2026-27962

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any...

UBUNTU-CVE-2026-28490

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption JWE RSA15 key management algorithm. Authlib registe...

UBUNTU-CVE-2026-28498

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...

CVE-2026-28498 Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...

CVE-2026-28498 Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...

CVE-2026-28498 Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...

CVE-2026-28498

In Authlib (Python), prior to version 1.6.9, a library‑level vulnerability in the OIDC ID Token validation path (_verify_hash) can fail‑open when an unsupported/unknown alg is used for at_hash/c_hash. An attacker could present a forged ID Token with an unrecognized alg header and bypass mandatory...

CVE-2026-28498

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...