{"id":"DEBIAN-CVE-2026-41479","details":"Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1.","modified":"2026-09-14T17:03:33.288598077Z","published":"2026-06-22T21:16:24.017Z","upstream":["CVE-2026-41479"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-41479"}],"affected":[{"package":{"name":"python-authlib","ecosystem":"Debian:13","purl":"pkg:deb/debian/python-authlib?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.0-1","1.6.0-1+deb13u1","1.6.1-1","1.6.3-1","1.6.4-1","1.6.5-1","1.6.6-1","1.6.7-1","1.6.8-1","1.6.9-1","1.7.0-1","1.7.2-1","1.7.2-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41479.json"}},{"package":{"name":"python-authlib","ecosystem":"Debian:14","purl":"pkg:deb/debian/python-authlib?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.2-1"}]}],"versions":["1.6.0-1","1.6.1-1","1.6.3-1","1.6.4-1","1.6.5-1","1.6.6-1","1.6.7-1","1.6.8-1","1.6.9-1","1.7.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41479.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"}]}