CVE-2026-1489

Name	CVE-2026-1489
Description	A flaw was found in GLib. An integer overflow vulnerability in its Unicode case conversion implementation can lead to memory corruption. By processing specially crafted and extremely large Unicode strings, an attacker could trigger an undersized memory allocation, resulting in out-of-bounds writes. This could cause applications utilizing GLib for string conversion to crash or become unstable.
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
glib2.0 (PTS)	bullseye	2.66.8-1+deb11u4	vulnerable
	bullseye (security)	2.66.8-1+deb11u7	vulnerable
	bookworm	2.74.6-2+deb12u8	vulnerable
	bookworm (security)	2.74.6-2+deb12u2	vulnerable
	trixie	2.84.4-3~deb13u2	vulnerable
	forky, sid	2.86.3-4	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/3872
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4983
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4984