CVE-2026-11311
HIGHDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Moderate risk: more likely to be exploited than 44% of all known CVEs.
References
Related Vulnerabilities
Other CWE-76 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-1883 | Medium | 6.3 | 61% | - | Fix |
| CVE-2024-34359 | Critical | 9.6 | 28% | - | - |
| CVE-2023-0493 | Medium | 5.3 | 7.9% | - | Fix |
| CVE-2024-1882 | High | 7.2 | 1.4% | - | Fix |
| CVE-2026-28292 | Critical | 9.8 | 1.3% | - | Fix |
| CVE-2024-2952 | Critical | 9.8 | 1.3% | - | Fix |
Common questions
How do I fix CVE-2026-11311?
Upgrade nginx gateway fabric to 2.6.4 or later.
Is CVE-2026-11311 being actively exploited?
Not that we know of. CVE-2026-11311 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.57% is the estimated probability that it will be exploited in the next 30 days. That is higher than 44% of all scored CVEs.
How severe is CVE-2026-11311?
CVE-2026-11311 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-11311 affect?
Published advisories record a fix for nginx gateway fabric (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-02.