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.
Affected products
gimp: gimp; redhat: enterprise linux
References8
- access.redhat.com/security/cve/CVE-2026-66758 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2507475 Issue TrackingVendor Advisory
- gitlab.gnome.org/GNOME/gimp/-/issues/16528 ExploitIssue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:50817 Issue Tracking
- access.redhat.com/errata/RHSA-2026:62507
- access.redhat.com/errata/RHSA-2026:73768
- access.redhat.com/errata/RHSA-2026:80509
- access.redhat.com/errata/RHSA-2026:93589
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 22 · as of 13 November 2026
- CWE
- CWE-190
Could this be exploited in your environment?
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