CVE-2026-66759: Gimp

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in the file-icns plugin in GIMP. When applying a decompressed mask during ICNS image processing, the plugin reads from the mask data buffer without verifying if the cursor exceeds the allocated resource size. If a crafted file contains a truncated mask resource, the icns_decompress function continues reading past the bounds of the buffer. This out-of-bounds read vulnerability results in information disclosure of heap contents, where memory contents are leaked as alpha channel pixel values, or a crash leading to a denial of service if unmapped memory is accessed.

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 2026-08-24.