CVE-2026-83618

CVE-2026-83618 · xmldom: requireWellFormed DocType publicId/systemId validation is bypassable via an embedded line terminator

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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 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.

CVSS 8.7 · Élevée · EPSS 0,6% · Correctif disponible

Publication

2026-09-01T14:49:46.201Z

Mise à jour

2026-09-04T01:59:23.360Z

Pile logicielle: system · node

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