Bug 2448162 (CVE-2026-28490) - CVE-2026-28490 authlib: Authlib: Information disclosure due to cryptographic padding oracle in JWE RSA1_5
Summary: CVE-2026-28490 authlib: Authlib: Information disclosure due to cryptographic ...
Keywords:
Status: NEW
Alias: CVE-2026-28490
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-16 18:02 UTC by OSIDB Bzimport
Modified: 2026-03-16 22:17 UTC (History)
37 users (show)

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Description OSIDB Bzimport 2026-03-16 18:02:24 UTC 
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.
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