CVE-2026-83608 xmldom: DocType `name` Injection Bypasses requireWellFormed

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, the DOCUMENTTYPENODE branch in lib/dom.js validates publicId, systemId, and internalSubset under...

CVE-2026-83608

xmldom (a pure JavaScript XML DOM module) is vulnerable to a DocType name injection that bypasses the requireWellFormed strict mode. The DOCUMENT_TYPE_NODE branch in lib/dom.js validates publicId, systemId, and internalSubset but emits DocumentType.name verbatim; a name containing > or whitesp...