Public vulnerability disclosure

CVE-2026-66758

Gimp: integer overflow in file-fits plugin causes a heap-based buffer overflow on crafted fits images

publishedCWE-190

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.

Investigate in Cyber JSON Markdown

Technical severity7.8 highCVSS 3.1 · CNA: redhat

Published2026-07-27Source updated 2026-11-02

Collected2026-11-022 attributed sources

Fixes and workarounds

Workaround

To mitigate this vulnerability, do not open FITS files from untrusted sources with GIMP.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
GIMP GNOME `gimp` https://gitlab.gnome.org/GNOME/gimp	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `gimp:2.8` https://access.redhat.com/downloads/content/package-browser/	≥ 8100020260824165450.4c9c024f; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `gimp` https://access.redhat.com/downloads/content/package-browser/	≥ 2:3.0.4-4.el9_8.9; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `gimp` https://access.redhat.com/downloads/content/package-browser/	≥ 2:2.99.8-4.el9_2.7; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `gimp` https://access.redhat.com/downloads/content/package-browser/	≥ 2:2.99.8-4.el9_4.19; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `gimp` https://access.redhat.com/downloads/content/package-browser/	≥ 2:2.99.8-4.el9_6.20; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `gimp` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Red Hat `gimp` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.8 high	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`	CNA: redhat

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2026:50817CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:62507CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:73768CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80509CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:93589CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-66758CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2507475CNA: redhat · issue-tracking, x_refsource_REDHAT
https://gitlab.gnome.org/GNOME/gimp/-/issues/16528CNA: redhat