CVE-2026-114614

The Authlib Python library (versions 0.13 through 1.8.0 ) is vulnerable due to a flaw in authlib.common.security.is_secure_transport() . The function uses a textual prefix comparison for loopback HTTP exemptions, which can be exploited if a URL's userinfo component begins with a loopback host whi...

CVE-2026-114614 Authlib: is_secure_transport() loopback exemption can be bypassed with a userinfo component, allowing cleartext-HTTP URLs to non-loopback hosts

Authlib is a Python library which builds OAuth and OpenID Connect servers. From 0.13 until 1.8.0, authlib.common.security.issecuretransport 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 ...