CVE-2026-18300

Name	CVE-2026-18300
Description	GIMP HDR File Parsing Integer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GIMP. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of HDR files. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29289.
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
gegl (PTS)	bullseye	1:0.4.26-2	vulnerable
	bullseye (security)	1:0.4.26-2+deb11u2	vulnerable
	bookworm, bookworm (security)	1:0.4.42-2+deb12u2	vulnerable
	trixie (security), trixie	1:0.4.62-2+deb13u2	vulnerable
	forky, sid	1:0.4.70-4	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
gegl	source	(unstable)	(unfixed)

Notes

https://www.zerodayinitiative.com/advisories/ZDI-26-453/
Fixed by: https://gitlab.gnome.org/GNOME/gegl/-/commit/d3d262008299341c5b032b354021632ceadb2799