{"id":"CVE-2026-83618","title":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module","summary":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.10 until 0.9.12, the requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId with Pub…","severity":"high","cwe":["CWE-91","CWE-625"],"vendor":"xmldom","product":"@xmldom/xmldom","affected":["@xmldom/xmldom >= 0.9.10, <= 0.9.11"],"patched":["@xmldom/xmldom 0.9.12"],"published":"2026-09-01","updated":"2026-09-08","sourceUpdated":"2026-09-08T21:11:31.703","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-83618","references":[{"url":"https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362","label":"security-advisories@github.com"},{"url":"https://github.com/xmldom/xmldom/pull/1071","label":"security-advisories@github.com"},{"url":"https://github.com/xmldom/xmldom/releases/tag/0.9.12","label":"security-advisories@github.com"},{"url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-vr34-hp96-76pp","label":"security-advisories@github.com"},{"url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-vr34-hp96-76pp","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83618"},{"url":"https://github.com/advisories/GHSA-vr34-hp96-76pp"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83618.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-83618"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2526855"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-83618"}],"tags":["nvd","ghsa","npm","csaf","vex","red-hat"],"aliases":["GHSA-vr34-hp96-76pp"],"ecosystem":"npm","epss":0.0057,"epssPercentile":0.46986,"ingestedAt":"2026-09-08T21:11:12.320Z","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cvssSource":"vendor","slug":"CVE-2026-83618","body":"## Overview\n\nxmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.10 until 0.9.12, the requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId with PubidLiteral_match and SystemLiteral_match expressions produced by reg() in lib/grammar.js, which inherit the multiline flag. A complete valid literal on the first line can therefore satisfy the matcher while U+000A, U+000D, U+2028, or U+2029 and breakout markup remain in the emitted <!DOCTYPE ...> declaration. This bypasses the strict-serialization mitigation for the earlier DocumentType injection advisory; creation and direct property assignment remain unvalidated by design. This issue is fixed in @xmldom/xmldom version 0.9.12.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-83618)\n\nAffected packages:\n\n- `@xmldom/xmldom >= 0.9.10, <= 0.9.11`\n\nPatched in:\n\n- `@xmldom/xmldom 0.9.12`\n\nSource: https://github.com/advisories/GHSA-vr34-hp96-76pp\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83618.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":212499,"id":"CVE-2026-83618","ts":1790668192638,"field":"cvss","old":null,"new":"7.5"}]}