Bug 2445120 (CVE-2026-28802) - CVE-2026-28802 authlib: Authlib: Signature verification bypass via malicious JWT allows unauthorized access
Summary: CVE-2026-28802 authlib: Authlib: Signature verification bypass via malicious ...
Keywords:
Status: NEW
Alias: CVE-2026-28802
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-06 07:02 UTC by OSIDB Bzimport
Modified: 2026-03-06 08:06 UTC (History)
35 users (show)

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Description OSIDB Bzimport 2026-03-06 07:02:12 UTC 
Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.
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