CVE-2026-18309

Name	CVE-2026-18309
Description	GIMP APNG 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 APNG 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-29401.
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	1145900

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	fixed
	trixie	3.0.4-3+deb13u9	fixed
	trixie (security)	3.0.4-3+deb13u10	fixed
	forky, sid	3.2.4-3	vulnerable

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

Package	Type	Release	Fixed Version	Debian Bugs
gimp	source	bullseye	(not affected)
gimp	source	bookworm	(not affected)
gimp	source	trixie	(not affected)
gimp	source	(unstable)	(unfixed)	1145900

Notes

[trixie] - gimp <not-affected> (Vulnerable code not present)
[bookworm] - gimp <not-affected> (Vulnerable code not present)
[bullseye] - gimp <not-affected> (Vulnerable code not present)
https://www.zerodayinitiative.com/advisories/ZDI-26-462/
Fixed by: https://gitlab.gnome.org/GNOME/gimp/-/commit/c760c8309d18bdf5259f1e04ced0779462c7c636
Introduced by: https://gitlab.gnome.org/GNOME/gimp/-/commit/bb9c43102fd3013ada9c99990c31171c5b99f104 (GIMP_3_1_2)