CVE-2026-1484

Name	CVE-2026-1484
Description	A flaw was found in the GLib Base64 encoding routine when processing very large input data. Due to incorrect use of integer types during length calculation, the library may miscalculate buffer boundaries. This can cause memory writes outside the allocated buffer. Applications that process untrusted or extremely large Base64 input using GLib may crash or behave unpredictably.
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)

https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4978
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4979