CVE-2026-11311: F5 NGINX Gateway Fabric · Improper Neutralization of Equvalent Special Elements
Affects F5 NGINX Gateway FabricSource CVE Database V5
Not known to be exploited · CVSS 8.1 High : upgrade to 2.6.4 soon.
Data as of 30 Oct 2026, 20:25 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.6.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 17 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade F5 NGINX Gateway Fabric to 2.6.4.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| F5NGINX Gateway Fabric | Affected
| Fixed in
|
AI-suggested
Until a fix is provided, restrict permissions to create or modify the affected Custom Resource Definitions to trusted administrators only to reduce the risk of exploitation.
Description
CVE-2026-11311 is an injection vulnerability in the NGINX configuration generator component of F5's NGINX Gateway Fabric version 2.5.0. Authenticated users with permission to create or modify certain Custom Resource Definitions can inject arbitrary NGINX configuration directives via unsanitized fields. There is no direct data plane exposure from this vulnerability.