xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line terminator, allowing injection on the default serialization path

{
  "id": "8053a7a4704d7ca8913ff0179f3c04c3695b9c4c3ad6d59c30c7497addfbb399",
  "url": "https://osv.dev/vulnerability/CVE-2026-83609",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line terminator, allowing injection on the default serialization path",
    "summary": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0 until 0.9.12, the shared reg() builder in lib/grammar.js compiles the anchored QName_exact validator with the multiline flag, so ^ and $ validate only one line instead of the complete name. createElementNS, createAttributeNS, createDocumentType, and createAttribute consequently accept a malformed XML name whose first line is valid and whose later text injects markup when serialized through either the default path or requireWellFormed: true. The triggering ECMAScript line terminators are U+000A, U+000D, U+2028, and U+2029. This issue is fixed in @xmldom/xmldom version 0.9.12.",
    "evidence": "osv:CVE-2026-83609",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-83609",
      "aliases": [
        "CVE-2026-83609",
        "GHSA-3px3-54cx-rmw9"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/xmldom/xmldom",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8c7c7afe89027641aa59c101d20eefedc0f54c6f"
                },
                {
                  "fixed": "0af8cf829d8a92bbac612903422c6947f5458f06"
                },
                {
                  "fixed": "7b2ec67e1750daadd0bb06c92e875e726544a362"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.9.0"
                      },
                      {
                        "fixed": "0.9.12"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7b2ec67e1750daadd0bb06c92e875e726544a362"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0af8cf829d8a92bbac612903422c6947f5458f06"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "0.9.12"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.9.11",
            "0.9.10",
            "0.9.9",
            "0.9.8",
            "0.9.7",
            "0.9.6",
            "0.9.5",
            "0.9.4",
            "0.9.3",
            "0.9.2",
            "0.9.1",
            "0.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-83609.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.368768479Z",
      "provider": "osv",
      "references": [
        "https://github.com/xmldom/xmldom/releases/tag/0.9.12",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83609.json",
        "https://github.com/xmldom/xmldom/security/advisories/GHSA-3px3-54cx-rmw9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-83609",
        "https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362",
        "https://github.com/xmldom/xmldom/pull/1071"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-625",
          "CWE-91"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83609.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-83609",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496270,
  "published_at": "2026-09-01T14:29:40.475+00:00"
}