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Vulnerability record · CVE-2026-66758 · published 27 July 2026

CVE-2026-66758: Gimp integer overflow vulnerability

Gimp · Gimp

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.

7.8 CVSS 3.1 High EPSS 0.36% · top 72.8% CWE-190 · Integer overflow
7.8CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
5References, 1 tagged exploit
2 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:50817 Issue Tracking
https://access.redhat.com/errata/RHSA-2026:62507
https://access.redhat.com/security/cve/CVE-2026-66758 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2507475 Issue TrackingVendor Advisory
https://gitlab.gnome.org/GNOME/gimp/-/issues/16528 ExploitIssue TrackingVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-66758), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.