CVE-2026-83607

Name	CVE-2026-83607
Description	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, Document.createElement(tagName) stores an unvalidated element name and XMLSerializer.serializeToString() emits that name verbatim. The requireWellFormed: true path did not validate the element qualified name or synthesized xmlns:PREFIX declaration, so attacker-controlled tag names could inject attributes, elements, or processing instructions into serialized XML or HTML and could cause cross-site scripting when browser-consumed. The unchecked values violate the XML QName constraint, and default serialization and creation-time createElement() behavior remain permissive. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-xmldom (PTS)	bookworm	0.8.6-1	vulnerable
	trixie	0.9.6-1	vulnerable
	forky, sid	0.9.11-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
node-xmldom	source	(unstable)	0.9.11-1

Notes

https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj
https://github.com/xmldom/xmldom/pull/1043
https://github.com/xmldom/xmldom/pull/1050
Fixed by: https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e (0.9.11)
Fixed by: https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44 (0.8.14)