CVE-2026-114614
lowAuthlib is a Python library which builds OAuth and OpenID Connect servers.
Vendor / product: Authlib — authlib
Authlib is a Python library which builds OAuth and OpenID Connect servers. From 0.13 until 1.8.0, authlib.common.security.is_secure_transport() uses a textual prefix comparison for loopback HTTP exemptions, so a URL whose userinfo begins with a loopback host can be accepted even when its parsed host is an external non-loopback system. An external party able to supply a URL to OIDC RP-Initiated Logout registration, authorization-server metadata validation, or another call site can bypass the TLS-required guard and cause cleartext redirection or acceptance of cleartext endpoints. The issue does not bypass redirect URI exact matching and does not by itself forge tokens or authenticate users. The vulnerable authlib.common.security.is_secure_transport() implementation in authlib/common/security.py misinterprets the userinfo component before OIDC RP-Initiated Logout dynamic client registration and other consumers enforce transport security. This issue is fixed in version 1.8.0.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/authlib/authlib/commit/95ad1f90acf0c7b9cf2a8f25e6eb3f1135b8dc70 security-advisories@github.com
- https://github.com/authlib/authlib/releases/tag/v1.8.0 security-advisories@github.com
- https://github.com/authlib/authlib/security/advisories/GHSA-jj7h-c3hg-m23x security-advisories@github.com
- https://github.com/authlib/authlib/security/advisories/GHSA-jj7h-c3hg-m23x 134c704f-9b21-4f2e-91b3-4a467353bcc0