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VULNERABILITIES

CVE-2026-28802 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA: redhat-SADPCVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:19375 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:4942 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:5168 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:5665 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:6309 redhat-SADP

see all 12 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-347Improper Verification of Cryptographic Signatureredhat-SADP
CWE-347Improper Verification of Cryptographic Signature[email protected]

Affected Products

ProductVersions
authlib authlib
>= 1.6.5, < 1.6.7

CPE

  • cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

12 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-28802
NVD Published Date:
Mar 6, 2026
NVD Last Modified:
Sep 10, 2026
Source:
[email protected]
CVE-2026-28802 Details - Not Deferred