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Vulnerability · Published Aug 24, 2026 · Assigned by redhat

CVE-2026-78465Gimp: integer overflow in pcx loader (planes=4) leads to heap overflow on 32-bit

High 7.0

In plain English

A high-severity integer overflow in GIMP from GNOME. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.0High
Exploit odds (30 days)0.3%top 79.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12gimpno fix listedDEBIAN-CVE-2026-78465
Debian:13gimp3.0.4-3+deb13u11DEBIAN-CVE-2026-78465
Debian:14gimp3.2.6-1DEBIAN-CVE-2026-78465
Ubuntu:26.04:LTSgimpno fix listedUBUNTU-CVE-2026-78465
Ubuntu:26.10gimpno fix listedUBUNTU-CVE-2026-78465

Affected products (as reported)

VendorProductVersions
GNOME GIMP see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-190 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References