CVE-2026-110601

Name	CVE-2026-110601
Description	libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 contains a heap out-of-bounds write vulnerability in gif_init_frame() in src/fromgif.c, which never checks the GIF transparent color index against the palette size. Attackers can supply a crafted GIF with a small color table and large transparent index, processed with a background color set, to write bytes past the palette buffer, causing heap corruption or crashes.
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
libsixel (PTS)	bookworm	1.10.3-3	vulnerable
	trixie	1.10.5-1	vulnerable
	forky, sid	1:1.8.7-r2-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libsixel	source	(unstable)	1:1.8.7-r2-1

Notes

[trixie] - libsixel <no-dsa> (Minor issue)
[bookworm] - libsixel <postponed> (Minor issue; can be fixed in next update)
https://github.com/saitoha/libsixel/issues/220
Fixed by: https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047 (v1.8.7-r1)