CVE-2026-83618

Описание

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 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.

A flaw was found in xmldom, a JavaScript XML parser and serializer module. A remote attacker could bypass the requireWellFormed strict-serialization mitigation for DocumentType injection by embedding line terminators within the publicId or systemId of a DocumentType declaration. This allows for the injection of arbitrary markup into the XML output, potentially leading to data manipulation or other security impacts depending on how the XML is processed.