CVE-2026-11311

Name of the Vulnerable Software and Affected Versions NGINX Gateway Fabric (affected versions not specified)

Description An injection issue exists in the NGINX configuration generator component when NGINX Plus is used as the data plane. User-supplied string values from the serverTokens field of the NginxProxy Custom Resource Definition and the extraAuthArgs field of the AuthenticationFilter Custom Resource Definition are rendered into NGINX configuration templates without proper sanitization or escaping. An authenticated attacker with permissions to create or modify these Custom Resource Definitions can inject arbitrary NGINX configuration directives. This is a control plane issue with no direct data plane exposure from the trigger.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.