CVE-2026-66758 — HIGH (7.8)

Vulnerability 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 Score

7.8

HIGH

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Gimp	Gimp	3.0.8
Redhat	Enterprise Linux	6.0

Related Weaknesses (CWE)

CWE-190

References

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

FAQ

What is CVE-2026-66758?

CVE-2026-66758 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...

How severe is CVE-2026-66758?

CVE-2026-66758 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-66758?

Check the references section above for vendor advisories and patch information. Affected products include: Gimp Gimp, Redhat Enterprise Linux.