ETK-2026-4279Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-4279",
  "cve_id": null,
  "display_id": "ETK-2026-4279",
  "ghsa_id": "GHSA-fvjq-6m4v-mw3m",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Path-scoped middleware bypass in @nestjs/platform-fastify",
  "summary": "@nestjs/platform-fastify versions before 11.2.9, and 12.x versions before 12.4.1, can apply path-scoped middleware inconsistently with route dispatch. A remote client able to control the raw HTTP request target may reach a handler without middleware-based authentication or authorization when the application uses MiddlewareConsumer path rules.",
  "mitigation": "Upgrade @nestjs/platform-fastify to 11.2.9 or 12.4.1. Until upgraded, have a reverse proxy normalize request targets before forwarding them and enforce access checks in route guards rather than path-scoped middleware.",
  "vendor": "npm",
  "product": "npm:@nestjs/platform-fastify",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 12.0.0, < 12.4.1"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "12.4.1"
      ],
      "package_name": "@nestjs/platform-fastify",
      "purl": "pkg:npm/@nestjs/platform-fastify"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 11.2.9"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "11.2.9"
      ],
      "package_name": "@nestjs/platform-fastify",
      "purl": "pkg:npm/@nestjs/platform-fastify"
    }
  ],
  "cwes": [
    288
  ],
  "cvss_score": 7,
  "cvss_src": "ethiack_provisional",
  "cvss_vector": null,
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 12.061196866666666,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-11-12T13:53:55+00:00",
      "days": -0.4397255441319444,
      "is_lower_bound": true,
      "measured_at": "2026-11-13T00:27:07.361860+00:00",
      "url": "https://github.com/nestjs/nest/security/advisories/GHSA-fvjq-6m4v-mw3m"
    }
  }
}