---
id: CVE-2026-66759
title: >-
  Gimp: out-of-bounds read in file-icns plugin causes information disclosure or
  crash on crafted icns images
summary: >-
  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
  crafte…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: GNOME
product: gimp
affected:
  - gimp >= 2.99.14 < *
  - gimp (all versions)
  - gimp
  - gimp
  - 'gimp:2.8/gimp'
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-27T19:25:27.419672Z'
exploitAvailable: true
published: '2026-07-27'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T22:13:21.283Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-66759'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:50817'
    label: 'RHSA-2026:50817'
  - url: 'https://access.redhat.com/security/cve/CVE-2026-66759'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507557'
    label: RHBZ#2507557
  - url: 'https://gitlab.gnome.org/GNOME/gimp/-/issues/16528'
tags:
  - cve.org
  - exploit-available
epss: 0.00305
epssPercentile: 0.23449
ingestedAt: '2026-11-05T23:41:31.952Z'
---

## Overview

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

- `gimp >= 2.99.14 < *`
- `gimp (all versions)`
- `gimp`
- `gimp`
- `gimp:2.8/gimp`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

To mitigate this vulnerability, do not open ICNS files from untrusted sources with GIMP.