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CVE-2026-66362 F5 CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-09-02T16:17:18.663Z and has not been modified since then. The NGINX Gateway Fabric's configuration generator component is vulnerable to injection attacks due to improper sanitization or escaping of user-supplied string values from Authentication Filter Custom Resource Definition fields (clientID, cookieName) or the clientSecret field of a referenced Secret. This allows an authenticated attacker with permission to create or modify these resources to craft values that inject arbitrary NGINX configuration directives, potentially leading to unauthorized configuration changes. The vulnerability has a CVSS score of 8.6 and is considered HIGH severity. NGINX Gateway Fabric administrators, users with permission to create or modify Authentication Filter Custom Resource Definitions or referenced Secrets, and security teams responsible for monitoring and protecting against potential injections and unauthorized configuration changes should take immediate action to mitigate the vulnerability.

Vendor
F5
Product
NGINX Gateway Fabric
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-02
Original CVE updated
2026-09-03
Advisory published
2026-09-02
Advisory updated
2026-09-03

Who should care

NGINX Gateway Fabric administrators, users with permission to create or modify Authentication Filter Custom Resource Definitions or referenced Secrets, and security teams responsible for monitoring and protecting against potential injections and unauthorized configuration changes.

Technical summary

The NGINX Gateway Fabric's configuration generator component is vulnerable to injection attacks. User-supplied string values from Authentication Filter Custom Resource Definition fields (clientID, cookieName) or the clientSecret field of a referenced Secret are rendered directly into NGINX configuration templates without proper sanitization or escaping. This allows an authenticated attacker with permission to create or modify these resources to craft values that inject arbitrary NGINX configuration directives, potentially leading to unauthorized configuration changes.

Defensive priority

Authenticated attackers with permission to create or modify specific resources may inject arbitrary NGINX configuration directives via user-supplied string values. Implement strict input validation and sanitization for Authentication Filter Custom Resource Definition fields and referenced Secret values.

Recommended defensive actions

  • Implement strict input validation and sanitization for Authentication Filter Custom Resource Definition fields (clientID, cookieName) and referenced Secret values.
  • Enforce least privilege for users with permission to create or modify these resources.
  • Regularly review and update NGINX Gateway Fabric configurations to detect and prevent potential injections.
  • Monitor NGINX Gateway Fabric logs for suspicious activity.
  • Apply vendor-provided patches or updates as they become available.

Evidence notes

The CVE-2026-66362 record indicates an injection vulnerability in NGINX Gateway Fabric's configuration generator component. User-supplied string values from Authentication Filter Custom Resource Definition fields (clientID, cookieName) or the clientSecret field of a referenced Secret are rendered directly into NGINX configuration templates without sanitization or escaping. An authenticated attacker with permission to create or modify these resources may craft values that inject arbitrary NGINX configuration directives.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-66362 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-66362

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-66362 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-66362

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.