{"id":"BIT-nginx-gateway-fabric-2026-91184","summary":"NGINX Gateway Fabric vulnerability","details":"Description\n\nNGINX Gateway Fabric has 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 \"\u003crealm\u003e\";. 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. \n\nImpact\n\nA remote authenticated attacker can send crafted requests to configure NGINX Gateway Fabric AuthenticationFilter CRD and may 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. There 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.","aliases":["CVE-2026-91184"],"modified":"2026-10-21T12:00:40.346956770Z","published":"2026-10-21T08:53:28.676Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://my.f5.com/manage/s/article/K000162609"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91184"}],"affected":[{"package":{"name":"nginx-gateway-fabric","ecosystem":"Bitnami","purl":"pkg:bitnami/nginx-gateway-fabric"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.4.0"},{"fixed":"2.8.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nginx-gateway-fabric/BIT-nginx-gateway-fabric-2026-91184.json"},"severity":[{"type":"CVSS_V4","score":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.9.0"}