CVE-2026-28490

MEDIUM

6.5

Description

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published3/16/2026

Last Modified3/17/2026

Sourcenvd

Honeypot Sightings0

Affected Products

authlib:authlib

Weaknesses (CWE)

CWE-203CWE-327

References

https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22(security-advisories@github.com)

https://github.com/authlib/authlib/releases/tag/v1.6.9(security-advisories@github.com)

https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78(security-advisories@github.com)

IOC Correlations

No correlations recorded

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