CVE-2026-66758 Gimp: integer overflow in file-fits plugin causes a heap-based buffer overflow on crafted fits images
An integer overflow in GIMP's FITS plugin allows attackers to trigger a heap buffer overflow via crafted images, potentially leading to code execution or crashes.
- 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
What is CVE-2026-66758?
CVE-2026-66758 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-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.
Weakness: CWE-190
Which versions are affected by CVE-2026-66758?
It affects 2 products.
Products include Gimp Gimp, Redhat Enterprise Linux.
How do I fix CVE-2026-66758?
Apply the vendor's patch.
Is CVE-2026-66758 being exploited?
There is no known exploitation of CVE-2026-66758 in the wild and no public exploit code.
Other vulnerabilities in Gimp Gimp
Sources
Also known as DEBIAN-CVE-2026-66758, GHSA-p2xc-g3qc-p2mq, UBUNTU-CVE-2026-66758.