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. 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| F5 | Nginx Gateway Fabric | >= 2.5.0, < 2.6.4 |
Related Weaknesses (CWE)
References
- https://my.f5.com/manage/s/article/K000161611Vendor Advisory
FAQ
What is CVE-2026-11311?
CVE-2026-11311 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-11311?
CVE-2026-11311 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-11311?
Check the references section above for vendor advisories and patch information. Affected products include: F5 Nginx Gateway Fabric.