CVE-2026-66758: gimp Integer Overflow or Wraparound

Vulnerability summary

CVE-2026-66758 is a high (CVSS 7.8) Integer Overflow or Wraparound vulnerability in gimp. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 20.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 27-07-2026
   PublishedVulnerability first disclosed.
2. 12-10-2026
   Last modifiedVulnerability information updated.

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.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.