{
  "cveId": "CVE-2026-83611",
  "url": "https://patchblox.com/security/cve/CVE-2026-83611",
  "summary": "CVE-2026-83611 is fixed in node-xmldom on 1 platform by DEBIAN-CVE-2026-83611 (version 0.9.12-1), released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content",
  "description": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as \u003C/a\\njunk\u003E, close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.",
  "published": "2026-09-01T15:17:39Z",
  "severity": "Moderate",
  "cwe": "Improper Validation of Syntactic Correctness of Input",
  "epss": 0.00619,
  "epssPercentile": 0.49965,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83611",
  "fixes": [
    {
      "platform": "linux",
      "product": "node-xmldom",
      "release": "Debian 14",
      "fixedVersion": "0.9.12-1",
      "fix": "DEBIAN-CVE-2026-83611",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-83611",
      "released": "2026-09-08T02:27:47Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T01:44:33Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}