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

Description (CNA)

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 (CNA)

Vendor / product	Versions
GNOME / GIMP	affected
Red Hat / Red Hat Enterprise Linux 6	unknown
Red Hat / Red Hat Enterprise Linux 7	unaffected
Red Hat / Red Hat Enterprise Linux 8	unaffected
Red Hat / Red Hat Enterprise Linux 9	unaffected

CWE

CWE-190

References

ADP enrichment

CISA-ADP

No English description supplied.

https://gitlab.gnome.org/GNOME/gimp/-/work_items/16578