Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.
History

Thu, 01 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 01 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-358
CWE-670
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Tue, 29 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Tue, 29 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-347
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

threat_severity

Important


Mon, 28 Sep 2026 21:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Mon, 28 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
References

Mon, 28 Sep 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Authlib
Authlib authlib
Vendors & Products Authlib
Authlib authlib

Mon, 28 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
Description Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.
Title Authlib library contains a signature‑verification bypass vulnerability
References

cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published: 2026-09-28T19:37:58.973Z

Updated: 2026-10-01T13:58:32.806Z

Reserved: 2026-09-23T15:59:27.145Z

Link: CVE-2026-96760

cve-icon Vulnrichment

Updated: 2026-09-28T20:07:57.835Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-28T20:17:11.703

Modified: 2026-10-01T14:17:32.147

Link: CVE-2026-96760

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-28T19:37:58Z

Links: CVE-2026-96760 - Bugzilla