CVE-2026-40912 is a high-severity security vulnerability affecting Traefik, an HTTP reverse proxy and load balancer. The vulnerability impacts versions prior to 3.4.5-r7. It has a CVSS 3.1 score of 8.2, indicating a network exploitable flaw with high confidentiality impact and low integrity impact, without requiring privileges or user interaction. A patch is available in version 3.4.5-r7.