{"schema":"threatline.record/2","record":{"id":"CVE-2026-91184","aliases":[],"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 \"<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. \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.","categories":["Web servers"],"product":"NGINX Gateway Fabric","vendor":"F5","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-91184","source_modified_at":"2026-10-15T10:31:15.425Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"NGINX Gateway Fabric","vendor":"F5","versions":[{"lessThan":"2.8.0","status":"affected","version":"2.4.0","versionType":"custom"}],"defaultStatus":"unknown"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-91184","source_modified_at":"2026-10-15T10:31:15.425Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"NGINX Gateway Fabric","ecosystem":null},"version":"2.8.0","basis":"first unaffected version stated in the CVE record"}],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00482,"percentile":0.40606,"score_date":"2026-10-23"},"published_at":"2026-10-14T14:40:27.849Z","modified_at":"2026-10-15T10:31:15.425Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-91184","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-15T10:31:15.425Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91184","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://my.f5.com/manage/s/article/K000162609","tags":["vendor-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-15T03:57:02.149250Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-15T10:31:15.425Z","content_hash":"b2e42aea6f54f55c4d066a2cab1bff511e55c92096d34dc830e6bd99dd87b135"}}