CVE-2026-28490 Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle

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-2026-28490

Authlib (Python) RSA1_5 JWE handling is vulnerable to Bleichenbacher padding oracle attacks. The issue stems from a length check in RSAAlgorithm.unwrap() that raises a distinct exception when padding is invalid, destroying the cryptographic BLEichenbacher mitigation provided by cryptography v46.0...

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-2026-27962 Authlib JWS JWK Header Injection: Signature Verification Bypass

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-2026-27962 Authlib JWS JWK Header Injection: Signature Verification Bypass

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-2026-27962

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...

aad-fastapi (>=1.0.0, <=1.1.2), aad-fastapi-dl37 (>=1.0.0, <=1.0.3) +239 more potentially affected by CVE-2026-27962 via authlib (>=0.10.0, <=1.6.8)

authlib PYPI version =0.10.0, =1.0.0, =1.0.0, =0.0.1, =1.0.2, =1.0.2, =0.4.0rc1, =0.1.0, =0.5.0, =1.3.0a20250904, =1.2.0a20250730, =1.2.0a20250730, =0.0.0, =1.2.0, =0.0.1, =0.1.0 and more Source cves: CVE-2026-27962 Source advisory: MEND:CVE-2026-27962...

CVE-2026-27962 Authlib JWS JWK Header Injection: Signature Verification Bypass

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-2026-27962

Authlib JWS JWK Header Injection (CVE-2026-27962) is detailed in GHSA-wvwj-cvrp-7pv5: when key=None is passed to JWS deserialization, or a key resolver returns None, the library silently uses the attacker-supplied header.jwk as the verification key, allowing forgeable tokens and bypass of authent...

GHSA-M344-F55W-2M6J Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding

Executive Summary A critical 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 responsible for validating the athash Access Token Hash and chash...

Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding

Executive Summary A critical 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 responsible for validating the athash Access Token Hash and chash...

EUVD-2026-12482

Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding...

meltano (>=1.60.0, <=2.1.0), molten-jwt (0.2.1) potentially affected by CVE-2026-28498 via authlib (0.10.0)

authlib PYPI version 0.10.0 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - meltano =1.60.0, =2.1.0 - molten-jwt 0.2.1 Source cves: CVE-2026-28498 Source advisory: OSV:GHSA-M344-F55W-2M6J...

molten-jwt (0.3.0) potentially affected by CVE-2026-28498 via authlib (0.12.1)

authlib PYPI version 0.12.1 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - molten-jwt 0.3.0 Source cves: CVE-2026-28498 Source advisory: OSV:GHSA-M344-F55W-2M6J...

authutils (5.0.3) potentially affected by CVE-2026-28498 via authlib (0.14.2)

authlib PYPI version 0.14.2 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - authutils 5.0.3 Source cves: CVE-2026-28498 Source advisory: OSV:GHSA-M344-F55W-2M6J...

authutils (>=6.1.2, <=6.2.2), dash-google-oauth (>=1.0.0, <=1.2.0) +1 more potentially affected by CVE-2026-28498 via authlib (0.11.0)

authlib PYPI version 0.11.0 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - authutils =6.1.2, =1.0.0, =0.1.2, =0.2.0.dev5 Source cves: CVE-2026-28498 Source advisory: OSV:GHSA-M344-F55W-2M6J...

lumapps-sdk (>=1.0.0b13, <=1.0.0b18) potentially affected by CVE-2026-28498 via authlib (0.14.1)

authlib PYPI version 0.14.1 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - lumapps-sdk =1.0.0b13, =1.0.0b18 Source cves: CVE-2026-28498 Source advisory: OSV:GHSA-M344-F55W-2M6J...

authlib-gino (>=0.1.0, <=0.3.0), cnmcclient (0.4.3) +14 more potentially affected by CVE-2026-28498 via authlib (0.14.3)

authlib PYPI version 0.14.3 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - authlib-gino =0.1.0, =0.1.2, =0.4.0, =0.1.2, =1.0.0b7, =0.2.0, =1.0.0, =7.0.8.dev28841, =3.5.6.dev19088, =5.1.1.dev24106 and more Source cves:...

bastion-key-client (>=1.0.1, <=1.4.0), fabric-am-handlers (>=0.11.0, <=1.4.0b2) +5 more potentially affected by CVE-2026-28498 via authlib (0.15.2)

authlib PYPI version 0.15.2 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - bastion-key-client =1.0.1, =0.11.0, =0.14.0, =0.4.0, =0.9.0, =1.0.0b1, =1.0.0 Source cves: CVE-2026-28498 Source advisory: OSV:GHSA-M344-F55W-2M6...

cumulusci (>=3.32.0, <=3.37.0.dev0), lumapps-sdk (>=1.1.3b5, <=2.0.3) +3 more potentially affected by CVE-2026-28498 via authlib (0.15.3)

authlib PYPI version 0.15.3 is affected by a known vulnerability. The following packages have a transitive dependency on authlib and may be impacted: - cumulusci =3.32.0, =1.1.3b5, =0.1.0, =0.53.1, =0.1.0, =0.1.9 Source cves: CVE-2026-28498 Source advisory: OSV:GHSA-M344-F55W-2M6J...