CVE-2026-28490: falha de alta gravidade em authlib
Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle
Publicada em
Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.
21Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 8.3epss 0.1%
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) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9.
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Produtos afetados
authlib · authlibCVEs relacionadas — authlib
No mesmo produto, das mais perigosas para as menos.
CVE-2025-61920HIGHAuthlib is vulnerable to Denial of Service via Oversized JOSE SegmentsEPSS 0.6%CVE-2026-27962CRITICALAuthlib JWS JWK Header Injection: Signature Verification BypassEPSS 0.6%CVE-2026-28802HIGHAuthlib: Setting `alg: none` and a blank signature appears to bypass signature verificationEPSS 0.5%CVE-2025-62706MEDIUMAuthlib : JWE zip=DEF decompression bomb enables DoSEPSS 0.5%CVE-2026-114620MEDIUMAuthlib: Unvalidated request_uri fetch in JWT-secured authorization request (JAR) leading to SSRFEPSS 0.4%CVE-2026-114618MEDIUMAuthlib: Default JWT bearer grant accepts assertions for the wrong audienceEPSS 0.4%