NGINX
CVE-2026-66362: NGF vulnerability
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.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| NGINX Gateway Fabric 2.5 | 2.6.8 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Workarounds
As this attack is conducted by authenticated users with Kubernetes role-based access control (RBAC) write access to the affected CRDs, the only complete mitigation is to restrict that access to fully trusted administrators only.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 12 Oct 2026.