CVE-2021-21366

Name	CVE-2021-21366
Description	xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. xmldom versions 0.4.0 and older do not correctly preserve system identifiers, FPIs or namespaces when repeatedly parsing and serializing maliciously crafted documents. This may lead to unexpected syntactic changes during XML processing in some downstream applications. This is fixed in version 0.5.0. As a workaround downstream applications can validate the input and reject the maliciously crafted documents.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3260-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-xmldom (PTS)	buster	0.1.27+ds-1	vulnerable
	buster (security)	0.1.27+ds-1+deb10u2	fixed
	bullseye	0.5.0-1+deb11u2	fixed
	bookworm, sid, trixie	0.8.6-1	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	buster	0.1.27+ds-1+deb10u2		DLA-3260-1
node-xmldom	source	(unstable)	0.5.0-1

Notes

https://github.com/xmldom/xmldom/security/advisories/GHSA-h6q6-9hqw-rwfv
https://github.com/xmldom/xmldom/commit/d4201b9dfbf760049f457f9f08a3888d48835135