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CVE-2026-114616 Details

Description

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute the deterministic HS256, HS384, or HS512 signature for arbitrary token claims and have Authlib treat the token as authentic. This issue is fixed in version 1.9.1.

Metrics

CVSS 3.x Severity and Vector Strings:

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

CNA: [email protected]CVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b	[email protected]	Patch
https://github.com/authlib/authlib/releases/tag/v1.9.1	[email protected]	Release Notes
https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg	[email protected]	ExploitMitigationVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1391	Use of Weak Credentials	[email protected]
CWE-287	Improper Authentication	[email protected]
CWE-326	Inadequate Encryption Strength	[email protected]

Affected Products

Product	Versions
authlib authlib	< 1.9.1
CPE cpe:2.3:a:authlib:authlib:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 30, 2026	CVE Modified	CISA-ADP
Oct 29, 2026	Initial Analysis	[email protected]
Oct 22, 2026	New CVE Received	[email protected]