CVE-2026-78465

Name	CVE-2026-78465
Description	A flaw was found in the file-pcx plugin in GIMP, affecting 32-bit builds only. When processing a PCX image file, the plugin calculates memory allocation sizes based on the image dimensions and the number of color planes. If a crafted file sets the number of planes to 4 alongside sufficiently large dimensions, the calculation exceeds the 32-bit integer limit and overflows, resulting in an undersized heap-based buffer allocation. This integer overflow issue results in a heap-based buffer overflow when the plugin subsequently writes image data into the undersized buffer, causing memory corruption, potentially leading to arbitrary code execution or a denial of service.
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)
Debian Bugs	1145875

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
gimp (PTS)	bookworm, bookworm (security)	2.10.34-1+deb12u10	vulnerable
	trixie (security), trixie	3.0.4-3+deb13u10	vulnerable
	forky	3.2.4-3	vulnerable
	sid	3.2.6-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
gimp	source	(unstable)	3.2.6-1			1145875

Notes

[trixie] - gimp <no-dsa> (Minor issue)
https://gitlab.gnome.org/GNOME/gimp/-/work_items/16578
Fixed by: https://gitlab.gnome.org/GNOME/gimp/-/commit/56e580c43a2de9c0005f57018013998999535e4d (GIMP_3_2_6)