What is CVE-2026-11311?

CVE-2026-11311 is a high-severity vulnerability in F5 Nginx Gateway Fabric, classified under CWE-76. CVSS score: 8.1/10. Published 2026-06-17.

How severe is CVE-2026-11311?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in F5 Nginx Gateway Fabric

CVE-2026-11311

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 Reso…

EPSS: 0.006 (43.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

F5 Nginx Gateway Fabric — versions 2.5.0
F5 Nginx_gateway_fabric

Weakness classification (CWE)

CWE-76
CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

f5sirt@f5.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-11311?: CVE-2026-11311 is a high-severity vulnerability in F5 Nginx Gateway Fabric, classified under CWE-76. CVSS score: 8.1/10. Published 2026-06-17.
How severe is CVE-2026-11311?: High severity. CVSS v3 base score is 8.1 out of 10.