CVE-2026-83613

Name	CVE-2026-83613
Description	xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMHandler.startElement in lib/dom-parser.js inserts every parsed attribute through setAttributeNode, while NamedNodeMap.setNamedItem in lib/dom.js calls the linear getNamedItem or getNamedItemNS lookup for each insertion. A well-formed element with many distinct attributes therefore requires quadratic comparisons during DOMParser.parseFromString() and can stall a Node.js event loop before application validation. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; 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	vulnerable

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)	(unfixed)

Notes

https://github.com/xmldom/xmldom/security/advisories/GHSA-8344-3jmq-59r6
https://github.com/xmldom/xmldom/pull/1071
https://github.com/xmldom/xmldom/pull/1072
Fixed by: https://github.com/xmldom/xmldom/commit/cfb09b5dbeb035fdfedc9f01e2bbaf226bf47cf3 (0.9.12)
Fixed by: https://github.com/xmldom/xmldom/commit/2c548f200cfec991cd5846627ef8f03542309213 (0.8.15)