CVE-2026-11311 NGINX Gateway Fabric vulnerability
Authenticated attackers can inject arbitrary NGINX directives via unsanitized CRD fields, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-11311?
CVE-2026-11311 is a high-severity code injection vulnerability in F5 NGINX Gateway Fabric, published on 17 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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 NginxProxy Custom Resource Definition serverTokens field and the AuthenticationFilter Custom Resource Definition extraAuthArgs field are rendered directly into NGINX configuration templates without sanitization or escaping. An authenticated attacker with permission to create or modify these Custom Resource Definitions may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure from the vulnerability trigger itself.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Which versions are affected by CVE-2026-11311?
1 open source package ship an affected version, including nginx-gateway-fabric. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nginx-gateway-fabric Bitnami | From 2.5.0 | 2.6.4 |
Products include F5 Nginx Gateway Fabric.
How do I fix CVE-2026-11311?
Upgrade nginx-gateway-fabric to 2.6.4 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-11311 being exploited?
There is no known exploitation of CVE-2026-11311 in the wild and no public exploit code.
Other vulnerabilities in F5 NGINX Gateway Fabric
Sources
Also known as BIT-nginx-gateway-fabric-2026-11311, GHSA-9566-3h6w-56pp.