{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.9.0-beta.1"
              },
              {
                "fixed": "0.9.12"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0b21623512cf859a6341122524abda5bbf92b44f"
            },
            {
              "fixed": "7ced40c06c28d151e996a97045018c3559ae4707"
            },
            {
              "fixed": "0af8cf829d8a92bbac612903422c6947f5458f06"
            }
          ],
          "repo": "https://github.com/xmldom/xmldom",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6mj3-qw4j-hgrw"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-178",
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83612.json"
  },
  "details": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0-beta.1 until 0.9.12, HTML-mode parsing through DOMParser.parseFromString() mishandles a mixed-case closing tag for the script, style, textarea, or title raw-text elements. parseHtmlSpecialContent, selected by isHTMLRawTextElement or isHTMLEscapableRawTextElement, uses a case-sensitive indexOf() and then calls substring() with a missing-close result of negative one, causing unstable parser progression and quadratic output amplification. A small untrusted text/html document can consequently consume disproportionate CPU and memory when parsed and serialized. This issue is fixed in @xmldom/xmldom version 0.9.12.",
  "id": "CVE-2026-83612",
  "modified": "2026-09-03T03:30:33.053193847Z",
  "published": "2026-09-01T14:36:23.638Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.9.12"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83612.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-6mj3-qw4j-hgrw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83612"
    },
    {
      "type": "FIX",
      "url": "https://github.com/xmldom/xmldom/commit/7ced40c06c28d151e996a97045018c3559ae4707"
    },
    {
      "type": "FIX",
      "url": "https://github.com/xmldom/xmldom/pull/1071"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "xmldom: HTML raw-text closing-tag case mismatch causes output amplification"
}