CVE-2026-66758: Gimp

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in the file-fits plugin in GIMP. When processing a FITS image file, the plugin calculates memory allocation sizes using signed 32-bit integers for width and height. If a crafted file sets both values to large values, their product exceeds 2^31 and overflows, resulting in an undersized heap-based buffer allocation. This integer overflow issue results in a heap-based buffer overflow when cfitsio subsequently writes a full row of pixels in the buffer, causing memory corruption, potentially leading to arbitrary code execution or a denial of service.

Affected products

• Gimp Gimp: version 3.0.8 only; version 3.2.4 only
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only; version 9.0 only

Published 2026-07-27. Last modified 2026-09-30.