CVE-2026-66362: CWE-76 in F5 NGINX Gateway Fabric
Description
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.
CVSS v3.1
Score 8.1high
Affected software
F5
NGINX Gateway Fabric
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
When NGINX Plus is used as the data plane for NGINX Gateway Fabric, the configuration generator component improperly handles user-supplied string values from Authentication Filter Custom Resource Definition fields (clientID, cookieName) and the clientSecret field of referenced Secrets. These values are inserted directly into NGINX configuration templates without sanitization or escaping, leading to an injection vulnerability (CWE-76). An authenticated attacker with permission to create or modify these resources can inject arbitrary NGINX directives, potentially impacting confidentiality and integrity of the control plane configuration. The vulnerability is identified as CVE-2026-66362 and has a CVSS 3.1 base score of 8.1 (high severity).
Potential Impact
An attacker with authenticated access and permission to create or modify specific resources in NGINX Gateway Fabric can inject arbitrary NGINX configuration directives. This can lead to compromise of the control plane's confidentiality and integrity. There is no exposure or impact on the data plane. The vulnerability does not allow unauthenticated access or direct data plane exploitation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict permissions to create or modify Authentication Filter Custom Resource Definitions and Secrets to trusted administrators only to reduce risk of exploitation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- f5
- Date Reserved
- 2026-07-30T21:15:36.935Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a984660acd9273b496cc37d
Added to database: 09/02/2026, 15:53:04 UTC
Last enriched: 09/07/2026, 13:19:38 UTC
Last updated: 10/17/2026, 06:48:19 UTC
Views: 126
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