{"id":"CVE-2026-83612","summary":"xmldom: HTML raw-text closing-tag case mismatch causes output amplification","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.","aliases":["GHSA-6mj3-qw4j-hgrw"],"modified":"2026-09-03T03:48:17.120474792Z","published":"2026-09-01T14:36:23.638Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83612.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-178","CWE-400"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/xmldom/xmldom","events":[{"introduced":"0b21623512cf859a6341122524abda5bbf92b44f"},{"fixed":"7ced40c06c28d151e996a97045018c3559ae4707"},{"fixed":"0af8cf829d8a92bbac612903422c6947f5458f06"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0.9.0-beta.1"},{"fixed":"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","0.9.0-beta.11","0.9.0-beta.10","0.9.0-beta.9","0.9.0-beta.8","0.9.0-beta.7","0.9.0-beta.6","0.9.0-beta.5","0.9.0-beta.4","0.9.0-beta.3","0.9.0-beta.2","0.9.0-beta.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-83612.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}