CVE-2026-83605

Summary

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.

Affected Software

VendorProductVersion RangeStatus
xmldomxmldom<= 0.6.0affected
@xmldomxmldom>= 0.7.0, < 0.8.14affected
@xmldomxmldom>= 0.9.0, < 0.9.11affected

Weaknesses

  • CWE-91: CWE-91: XML Injection (aka Blind XPath Injection)

References