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xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed

Type: advisorySources: OSV

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-83605
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 20:40 UTC · Revision 1

Source evidence

xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed

core-osv · Original source

Published 1 Sept 2026, 14:18 UTC

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.

osv:CVE-2026-83605
Complete source record
{
  "id": "343f84a0f7fccb75008c295653d13fa2847a726abe42069c8e4417bd10011a16",
  "url": "https://osv.dev/vulnerability/CVE-2026-83605",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed",
    "summary": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.",
    "evidence": "osv:CVE-2026-83605",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-83605",
      "aliases": [
        "CVE-2026-83605",
        "GHSA-4w3w-2rp5-g8jm"
      ],
      "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": "0"
                },
                {
                  "last_affected": "c80a161172cc4d8733583bf0cf59abfa589f6d9e"
                },
                {
                  "introduced": "c568938641cc1f121cef5b4df80fcfda1e489b6e"
                },
                {
                  "fixed": "8a83f8ebf53604a733cb580bfc4ff9c0ae014d92"
                },
                {
                  "introduced": "8c7c7afe89027641aa59c101d20eefedc0f54c6f"
                },
                {
                  "fixed": "1f0610959ab7b82cc7ad702d1be0243efc5791c0"
                },
                {
                  "fixed": "cba1321218b069182695813fa7565653708e172e"
                },
                {
                  "fixed": "d8212e632507eaf1d9f609657dd4c56abeb12d44"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.6.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.7.0"
                      },
                      {
                        "fixed": "0.8.14"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.9.0"
                      },
                      {
                        "fixed": "0.9.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "cba1321218b069182695813fa7565653708e172e"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d8212e632507eaf1d9f609657dd4c56abeb12d44"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8a83f8ebf53604a733cb580bfc4ff9c0ae014d92"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "0.8.14"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1f0610959ab7b82cc7ad702d1be0243efc5791c0"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "0.9.11"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.8.13",
            "0.9.10",
            "0.9.9",
            "0.8.12",
            "0.8.11",
            "0.8.10",
            "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",
            "0.8.9",
            "0.8.8",
            "0.8.7",
            "0.8.6",
            "0.8.5",
            "0.8.4",
            "0.8.3",
            "0.8.2",
            "0.8.1",
            "0.8.0",
            "0.7.3",
            "0.7.2",
            "0.7.1",
            "0.7.0+scoped",
            "v0.7.0",
            "0.7.0+unscoped",
            "0.7.0",
            "0.6.0",
            "0.5.0",
            "0.4.0",
            "0.3.0",
            "0.2.1",
            "0.2.0",
            "v0.1.28-xmldom-alpha",
            "v0.1.28-not-published",
            "xmldom-aplha@v0.1.28",
            "v0.1.27",
            "0.1.27",
            "0.1.26",
            "0.1.25",
            "0.1.24",
            "0.1.23",
            "0.1.22",
            "0.1.21",
            "0.1.20",
            "0.1.19",
            "0.1.18",
            "0.1.17",
            "0.1.2",
            "0.1.1",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-83605.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.508527785Z",
      "provider": "osv",
      "references": [
        "https://github.com/xmldom/xmldom/releases/tag/0.8.14",
        "https://github.com/xmldom/xmldom/releases/tag/0.9.11",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83605.json",
        "https://github.com/xmldom/xmldom/security/advisories/GHSA-4w3w-2rp5-g8jm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-83605",
        "https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e",
        "https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44",
        "https://github.com/xmldom/xmldom/pull/1043",
        "https://github.com/xmldom/xmldom/pull/1050"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-91"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83605.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-83605",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520342,
  "published_at": "2026-09-01T14:18:20.752+00:00"
}