# CVE-2026-66759: Gimp: out-of-bounds read in file-icns plugin causes information disclosure or crash on crafted icns images

> A crafted ICNS image triggers an out-of-bounds read in GIMP, leaking heap memory or causing a crash.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 27 Jul 2026
- **Updated:** 24 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-66759, GHSA-2gmh-5658-rrq3, UBUNTU-CVE-2026-66759

## What is CVE-2026-66759?

CVE-2026-66759 is a high-severity vulnerability in Gimp Gimp, published on 27 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-66759?

It affects 2 products.


Products: Gimp Gimp, Redhat Enterprise Linux.

## How do I fix CVE-2026-66759?

Apply the vendor's patch.

## Is CVE-2026-66759 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66759 exists.

## Other vulnerabilities in Gimp Gimp

- [CVE-2010-4541](https://insights.sbomify.com/CVE-2010-4541/): Memory corruption in n/a (critical 9.3)
- [CVE-2009-3909](https://insights.sbomify.com/CVE-2009-3909/): Integer overflow in n/a (critical 9.3)
- [CVE-2009-1570](https://insights.sbomify.com/CVE-2009-1570/): Integer overflow in n/a (critical 9.3)
- [CVE-2009-0723](https://insights.sbomify.com/CVE-2009-0723/): Integer overflow in n/a (critical 9.3)
- [CVE-2009-0733](https://insights.sbomify.com/CVE-2009-0733/): Memory corruption in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66759 and fix it if it is affected.

What it is: CVE-2026-66759 is a high-severity vulnerability in Gimp Gimp, published on 27 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66759 exists.

Affected product: Gimp Gimp. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-66759/ (Markdown: https://insights.sbomify.com/CVE-2026-66759/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66759
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66759
- OSV: https://osv.dev/vulnerability/CVE-2026-66759

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66759/
Summaries are generated and may contain mistakes; the official description above is the record.