CVE-2026-83617
xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded line terminator
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.11 until 0.9.12, the requireWellFormed: true element and attribute name checks use the anchored QName_exact expression produced by reg() in lib/grammar.js, which inherits the multiline flag. A name with a valid first line followed by U+000A, U+000D, U+2028, or U+2029 and breakout markup therefore passes validation and is emitted verbatim in element start and end tags or attribute names. This bypasses the strict-serialization checks introduced for the earlier element-name and attribute-name injection advisories, while the default serialization path remains outside the strict guarantee. This issue is fixed in @xmldom/xmldom version 0.9.12.
| CWE | CWE-91 CWE-625 |
| Vendor | xmldom |
| Product | xmldom |
| Published | Sep 1, 2026 |
| Last Updated | Sep 1, 2026 |
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