NGINX Gateway Fabric vulnerability

{
  "id": "902eed5b5fc99d2a9f0dcce39b16444db1a934f281a883a4b778d8aa65eb6338",
  "url": "https://osv.dev/vulnerability/BIT-nginx-gateway-fabric-2026-91184",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NGINX Gateway Fabric vulnerability",
    "summary": "Description NGINX 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 \"\";. 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. Impact A 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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
    "evidence": "osv:BIT-nginx-gateway-fabric-2026-91184",
    "products": [
      {
        "name": {
          "value": "nginx-gateway-fabric",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.8.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-nginx-gateway-fabric-2026-91184",
      "aliases": [
        "BIT-nginx-gateway-fabric-2026-91184",
        "CVE-2026-91184"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "2.4.0"
                },
                {
                  "fixed": "2.8.0"
                }
              ]
            }
          ],
          "package": {
            "name": "nginx-gateway-fabric",
            "purl": "pkg:bitnami/nginx-gateway-fabric",
            "ecosystem": "Bitnami"
          },
          "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"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/nginx-gateway-fabric/BIT-nginx-gateway-fabric-2026-91184.json"
          }
        }
      ],
      "modified": "2026-10-21T12:00:40.346956770Z",
      "provider": "osv",
      "references": [
        "https://my.f5.com/manage/s/article/K000162609",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-91184"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-91184",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 393023,
  "published_at": "2026-10-21T08:53:28.676+00:00"
}