CVE-2026-66362: F5 Nginx Gateway Fabric

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Description: When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in the NGINX configuration generator component of NGINX Gateway Fabric. User-supplied string values from the Authentication Filter Custom Resource Definition clientID or cookieName fields, or in the clientSecret field of a Secret referenced by an Authentication Filter, are rendered directly into NGINX configuration templates without sanitization or escaping. Impact: An authenticated attacker with permission to create or modify these resources may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure.

Affected products

• F5 Nginx Gateway Fabric: from 2.5.0, before 2.6.8 (fixed in 2.6.8)

Published 2026-09-02. Last modified 2026-09-03.