CVE-2025-12863

Name	CVE-2025-12863
Description	A flaw was found in the xmlSetTreeDoc() function of the libxml2 XML parsing library. This function is responsible for updating document pointers when XML nodes are moved between documents. Due to improper handling of namespace references, a namespace pointer may remain linked to a freed memory region when the original document is destroyed. As a result, subsequent operations that access the namespace can lead to a use-after-free condition, causing an application crash.
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)
Debian Bugs	1120364

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libxml2 (PTS)	bullseye	2.9.10+dfsg-6.7+deb11u4	vulnerable
	bullseye (security)	2.9.10+dfsg-6.7+deb11u9	vulnerable
	bookworm, bookworm (security)	2.9.14+dfsg-1.3~deb12u4	vulnerable
	trixie (security), trixie	2.12.7+dfsg+really2.9.14-2.1+deb13u1	vulnerable
	forky	2.14.6+dfsg-0.1	vulnerable
	sid	2.15.1+dfsg-0.3	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libxml2	source	(unstable)	(unfixed)			1120364

https://gitlab.gnome.org/GNOME/libxml2/-/issues/1012
https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/349