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Fencer Vulns
high 7.0

CVE-2026-78465 json

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

published 2026-08-24 2 mo ago modified 2026-11-05 4 d ago also EUVD-2026-64935

cvss
7.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

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.

Patch / fix

  • gimp Debian 13 3.0.4-3+deb13u11
  • gimp Debian 14 3.2.6-1

debian advisories DEBIAN-CVE-2026-78465

  • gimp SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 2.10.30-150400.3.74.1

suse advisories SUSE-SU-2026:4309-1

  • gimp openSUSE Leap 16.0 3.0.8-bp160.9.1
  • gimp openSUSE Tumbleweed 3.2.6-1.1

opensuse advisories openSUSE-SU-2026:21869-1openSUSE-SU-2026:11771-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-78465 updated cvss 7.0

gimp: integer overflow in PCX loader (planes=4) leads to heap overflow on 32-bit

  • Red Hat Enterprise Linux 6 gimp, gimp-libs, gimp-devel-tools, gimp-help-browser
    affected: workaround, no fix planned “To mitigate this vulnerability, do not open PCX files from untrusted sources with GIMP.”
  • Red Hat Enterprise Linux 7 gimp, gimp-libs, gimp-devel-tools Red Hat Enterprise Linux 8 gimp, pygtk2, gimp-libs, pygobject2, python2-cairo, pygtk2-codegen, +3 more Red Hat Enterprise Linux 9 gimp, gimp-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/gimp/-/work_items/16578 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • GNOME GIMP
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.