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VulnerabilityPublished

CVE-2026-11311: F5 NGINX Gateway Fabric · Improper Neutralization of Equvalent Special Elements

Affects F5 NGINX Gateway FabricSource CVE Database V5

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Not known to be exploited · CVSS 8.1 High : upgrade to 2.6.4 soon.

Data as of 30 Oct 2026, 20:25 UTC

CVSS 3.1 base score
8.1High
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
F5NGINX Gateway FabricAffected
  • >=2.5.0 <2.6.4
Fixed in
  • 2.6.4

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.

References

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