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

Status: published. Published: 2026-08-24. Updated: 2026-11-04.

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.

## Remediation

- workaround: To mitigate this vulnerability, do not open PCX files from untrusted sources with GIMP. (source: CNA: redhat)

## Affected products and versions

- GNOME / GIMP (gimp): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gimp): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gimp): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gimp:2.8/gimp): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gimp): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7 (high); CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.28% as of 2026-11-04; percentile 20.67%

- SSVC: exploitation poc; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-190

## Exploit evidence

- exploit: https://gitlab.gnome.org/GNOME/gimp/-/work_items/16578 (ADP: CISA-ADP)

## References

- https://access.redhat.com/security/cve/CVE-2026-78465 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2522057 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.gnome.org/GNOME/gimp/-/work_items/16578 (CNA: redhat)

- https://gitlab.gnome.org/GNOME/gimp/-/work_items/16578 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-78465; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-78465; retrieved 2026-11-05; source updated Not reported

Revision: af9aac21070d8ef4b45ddfde2e2f0a2fa1ddd7f9e25e6984b0d8c9ae209b69ee

Canonical: https://y2.dev/cve/CVE-2026-78465

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