CVE-2025-4373

Name	CVE-2025-4373
Description	A flaw was found in GLib, which is vulnerable to an integer overflow in the g_string_insert_unichar() function. When the position at which to insert the character is large, the position will overflow, leading to a buffer underwrite.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, 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
glib2.0 (PTS)	bullseye	2.66.8-1+deb11u4	vulnerable
	bullseye (security)	2.66.8-1+deb11u6	vulnerable
	bookworm	2.74.6-2+deb12u5	vulnerable
	bookworm (security)	2.74.6-2+deb12u2	vulnerable
	sid, trixie	2.84.1-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
glib2.0	source	(unstable)	(unfixed)

Notes

https://gitlab.gnome.org/GNOME/glib/-/issues/3677
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4588
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4592