Vulnerability · Published Aug 20, 2026 · Assigned by zdi

CVE-2026-18309GIMP APNG File Parsing Integer Overflow Remote Code Execution Vulnerability

High 7.8

In plain English

A high-severity integer overflow in GIMP from GIMP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.0)7.8High

Exploit odds (30 days)0.5%top 59.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:14	gimp	3.2.6-1	DEBIAN-CVE-2026-18309
Ubuntu:26.04:LTS	gimp	no fix listed	UBUNTU-CVE-2026-18309
Ubuntu:26.10	gimp	no fix listed	UBUNTU-CVE-2026-18309

Affected products (as reported)

Vendor	Product	Versions
GIMP	GIMP	3.2.2

Weakness: CWE-190 · Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

ZDI-26-462 x_research-advisory
vendor-provided URL vendor-advisory