CVE-2026-112085

{
  "etk_id": "ETK-2026-2414",
  "cve_id": "CVE-2026-112085",
  "display_id": "CVE-2026-112085",
  "ghsa_id": "GHSA-cfqc-fj3v-j925",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "anchored",
  "title": "Cross-origin WebSocket proxy bypass in webpack-dev-server",
  "summary": "webpack-dev-server versions before 5.2.7 and version 6.0.0 do not apply allowed-host checks to certain proxied WebSocket upgrade requests. A malicious site visited by a developer may use the development server to read from or send data to the proxied backend when WebSocket forwarding is configured, including when the server listens only on loopback.",
  "mitigation": "Upgrade webpack-dev-server to 5.2.7, 6.1.0, or a later release. Until upgraded, disable unnecessary WebSocket forwarding in proxy entries and limit proxies to required paths.",
  "vendor": "webpack-dev-server",
  "product": "webpack-dev-server",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 5.2.7"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "5.2.7"
      ],
      "package_name": "webpack-dev-server",
      "purl": "pkg:npm/webpack-dev-server"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 6.0.0, < 6.1.0"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "6.1.0"
      ],
      "package_name": "webpack-dev-server",
      "purl": "pkg:npm/webpack-dev-server"
    }
  ],
  "cwes": [
    346
  ],
  "cvss_score": 8.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 12.094189633333333,
  "t0_at": "2026-10-22T09:31:59.124000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-22T09:31:59.124000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-22T09:31:59.124000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-112085"
    }
  }
}