CVE-2026-58012

Name	CVE-2026-58012
Description	A flaw was found in GLib. A buffer over-read can occur in the g_regex_replace function when used with the `G_REGEX_RAW` compile flag and case-change replacement escapes because the string_append function processes matched substrings using UTF-8 functions that assume valid UTF-8 input, even when the string is treated as raw bytes. This vulnerability can cause a minor information disclosure of 1-5 bytes and a denial of service when the buffer over-read crosses a page boundary.
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+deb11u8	vulnerable
	bookworm	2.74.6-2+deb12u9	vulnerable
	bookworm (security)	2.74.6-2+deb12u2	vulnerable
	trixie	2.84.4-3~deb13u3	vulnerable
	forky, sid	2.88.2-1	fixed

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)	2.88.1-2

Notes

[trixie] - glib2.0 <no-dsa> (Minor issue)
https://gitlab.gnome.org/GNOME/glib/-/work_items/3918
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/5132 (2.89.0)
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/5134 (2.88.1)
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/5135 (2.86.5)