CVE-2026-114614 Authlib: is_secure_transport() loopback exemption can be bypassed with a userinfo component, allowing cleartext-HTTP URLs to non-loopback hosts
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-114614?
CVE-2026-114614 is a low-severity vulnerability in authlib, published on 22 Oct 2026.
Official description
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.
Which versions are affected by CVE-2026-114614?
2 open source packages ship an affected version, including authlib. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
authlib PyPI | All versions | 1.8.0 |
authlib PyPI | All versions | 1.8.0 |
Products include Authlib Authlib.
How do I fix CVE-2026-114614?
Upgrade authlib to 1.8.0 or later.
Is CVE-2026-114614 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-114614 exists.
Other vulnerabilities in authlib
- CVE-2026-27962 Authlib JWS JWK Header Injection: Signature Verification Bypass
- CVE-2026-28490 Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle
- CVE-2026-28498 Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding
- CVE-2026-28802 Authlib: Setting `alg: none` and a blank signature appears to bypass signature verification
- CVE-2025-61920 Authlib is vulnerable to Denial of Service via Oversized JOSE Segments
Sources
Also known as DEBIAN-CVE-2026-114614, ECHO-4dee-6cb2-c9e4, GHSA-jj7h-c3hg-m23x, MINI-64x4-p8x7-g63r, MINI-9mg4-g9mh-46cw, UBUNTU-CVE-2026-114614.