CVE-2026-66362

HIGH 8.1

NGF vulnerability

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

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 Authentication Filter Custom Resource Definition clientID or cookieName fields, or in the clientSecret field of a Secret referenced by an Authentication Filter, are rendered directly into NGINX configuration templates without sanitization or escaping. Impact: An authenticated attacker with permission to create or modify these resources may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure.

CWE	CWE-76
Vendor	f5
Product	nginx gateway fabric
Published	Sep 2, 2026
Last Updated	Sep 3, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

F5 / NGINX Gateway Fabric

2.5.0 < 2.6.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

my.f5.com: https://my.f5.com/manage/s/article/K000162600

Credits

F5 acknowledges Rushit Palesha (GitHub: rushitgit) and Sujal Tuladhar (EvilGenius) for bringing this issue to our attention and following the highest standards of coordinated disclosure.