{
  "cveId": "CVE-2026-19534",
  "url": "https://patchblox.com/security/cve/CVE-2026-19534",
  "summary": "CVE-2026-19534 is fixed in 31 products on 1 platform, first by RHSA-2026:84703, released September 4, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "node-undici: undici\u0027s WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with...",
  "description": "undici\u0027s WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with a subprotocol that the client never requested. A default WebSocket connection sends no subprotocol, but if the server\u0027s 101 response includes a Sec-WebSocket-Protocol header, undici dereferences a null value while checking it against the requested list and throws an uncaught TypeError. Because that code runs inside a microtask with no surrounding error handling, the exception propagates and terminates the process under Node\u0027s default behavior, instead of gracefully failing the connection as required by the WebSocket protocol. Any application that opens a WebSocket to an attacker-controlled or compromised server, or over a plaintext connection subject to a machine-in-the-middle, can be crashed remotely without authentication in the default configuration. This affects undici versions from 6.7.0 up to 6.28.1, from 7.0.0 up to 7.29.1, and from 8.0.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.",
  "published": "2026-09-04T17:10:05Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00394,
  "epssPercentile": 0.33841,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "product": "node-undici",
      "release": "Debian 14",
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      "fix": "DEBIAN-CVE-2026-19534",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-19534",
      "released": "2026-09-10T12:12:19Z"
    },
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      "product": "nodejs",
      "release": "RHEL 8",
      "fixedVersion": "1:22.23.2-2.module\u002Bel8.10.0\u002B24957\u002B74108fbf",
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      "release": "RHEL 9",
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      "fix": "RHSA-2026:76750",
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      "released": "2026-09-30T20:41:18Z"
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}