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Authlib 0.4 | Vulnerabilities | Sonatype Guide
pypi
Authlib
0.4
Authlib 0.4
Published
Jan 31, 2018
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6.5
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) 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.
affected
Severity
Medium
Published
Mar 17, 2026
