{"cve":"CVE-2026-83612","nvd":{"published":"2026-09-01T15:17:39.430","modified":"2026-09-08T21:11:31.703","status":"Deferred","description":"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.","cvss_v4":{"vector":"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","score":8.7},"cvss_v3":null,"cwes":["CWE-178","CWE-400"],"references":["https://github.com/xmldom/xmldom/commit/7ced40c06c28d151e996a97045018c3559ae4707","https://github.com/xmldom/xmldom/pull/1071","https://github.com/xmldom/xmldom/releases/tag/0.9.12","https://github.com/xmldom/xmldom/security/advisories/GHSA-6mj3-qw4j-hgrw","https://github.com/xmldom/xmldom/security/advisories/GHSA-6mj3-qw4j-hgrw"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-83612","score":0.00524,"percentile":0.44447,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-6mj3-qw4j-hgrw","url":"https://osv.dev/vulnerability/GHSA-6mj3-qw4j-hgrw","summary":"xmldom: HTML raw-text closing-tag case mismatch causes output amplification","modified":"2026-09-08T21:15:03.941065869Z","packages":[{"ecosystem":"npm","name":"@xmldom/xmldom","purl":"pkg:npm/%40xmldom/xmldom","ranges":[">=0.9.0-beta.1 <0.9.12"],"fixed":["0.9.12"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}