CVE-2026-28802

python-authlib: Authlib is a Python library which builds OAuth and OpenID Connect servers

CVE-2026-28802 is fixed in python-authlib on 1 platform by DEBIAN-CVE-2026-28802 (version 1.6.7-1), released March 6, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent
CVSS
9.8
critical
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0054
45th percentile

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.

Where it's fixed

ProductFixed inFixReleased
Linux
python-authlib · Debian 14 1.6.7-1 DEBIAN-CVE-2026-28802 Mar 6, 2026

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