{"id":"CVE-2026-91184","revision":"21e6e03d2e7448bab1bb8e075d1a81d1","records":[{"revision":"21e6e03d2e7448bab1bb8e075d1a81d1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-91184","aliases":[],"title":"NGINX Gateway Fabric vulnerability","description":"Description\n\nNGINX Gateway Fabric\u00A0has a vulnerability when it renders the spec.basic.realm (and spec.jwt.realm) field of a namespaced AuthenticationFilter verbatim, unescaped and unvalidated, into the shared data-plane nginx.conf as auth_basic \"<realm>\";. A namespaced authenticated attacker that configures AuthenticationFilter CRD to an HTTPRoute/GRPCRoute on a shared Gateway can craft a realm value that closes the quoted directive and the enclosing location {} block and injects arbitrary NGINX directives into that Gateway's data-plane config.\u00A0\n\nImpact\n\nA remote authenticated attacker can send crafted requests to configure NGINX Gateway Fabric\u00A0AuthenticationFilter CRD and\u00A0may be able to read every co-located tenant's mounted secrets, SSRF via proxy_pass, reading the pod ServiceAccount token, or hijacking other tenants' routes.\u00A0There is no data plane exposure; this is a control plane issue only.\n\n\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","state":0,"publishedAt":"2026-10-14T14:40:27.849+00:00","modifiedAt":"2026-10-15T10:31:15.425+00:00","affected":[{"ecosystem":"Vendor product","name":"NGINX Gateway Fabric","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unknown\",\n                    \"modules\": [\n                        \"NGF\"\n                    ],\n                    \"product\": \"NGINX Gateway Fabric\",\n                    \"vendor\": \"F5\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"2.8.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"2.4.0\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"},{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"}],"references":["https://my.f5.com/manage/s/article/K000162609"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-91184","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-91184","identifiers":["CVE-2026-91184"]},"retained":false,"historicalAffected":[]}],"coverage":[]}