CVE-2026-34601

Name	CVE-2026-34601
Description	xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In xmldom versions 0.6.0 and prior and @xmldom/xmldom prior to versions 0.8.12 and 0.9.9, xmldom/xmldom allows attacker-controlled strings containing the CDATA terminator ]]> to be inserted into a CDATASection node. During serialization, XMLSerializer emitted the CDATA content verbatim without rejecting or safely splitting the terminator. As a result, data intended to remain text-only became active XML markup in the serialized output, enabling XML structure injection and downstream business-logic manipulation. This issue has been patched in xmldom version 0.6.0 and @xmldom/xmldom versions 0.8.12 and 0.9.9.
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)	bullseye	0.5.0-1+deb11u2	vulnerable
	bookworm	0.8.6-1	vulnerable
	trixie	0.9.6-1	vulnerable
	forky, sid	0.9.8-2	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-wh4c-j3r5-mjhp
Fixed by: https://github.com/xmldom/xmldom/commit/2b852e836ab86dbbd6cbaf0537f584dd0b5ac184 (0.9.9)
Fixed by: https://github.com/xmldom/xmldom/commit/ed08df7572f4236d4fd88d16063c3fd8f59c7884 (0.8.12)