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.
1.5.1-11.5.2-11.6.0-10.15.5-1ubuntu0.1~esm21.3.0-1ubuntu0.1~esm21.6.7-1ubuntu0.1~esm1Exploitability
AV:NAC:HAT:PPR:NUI:NVulnerable System
VC:HVI:LVA:NSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N