CVE-2026-66757: Integer Overflow or Wraparound in GNOME GIMP
A flaw was found in the file-sgi plugin in GIMP. When processing an RLE-compressed SGI image, the plugin allocates memory for a row table. The image header dimensions (ysize and zsize) are read as 16-bit unsigned integers. If a crafted file sets both dimensions to their maximum value (65535), the multiplication ysize * zsize overflows the standard 32-bit int boundary before being passed to calloc. This integer overflow issue results in undefined behavior, aborting the plugin and causing a denial of service.
AI Analysis
Technical Summary
The vulnerability exists in the file-sgi plugin of GIMP, which processes RLE-compressed SGI images. The plugin reads the ysize and zsize dimensions as 16-bit unsigned integers. When both are set to 65535, their multiplication overflows a 32-bit integer boundary before being passed to calloc for memory allocation. This integer overflow leads to undefined behavior, causing the plugin to abort and resulting in a denial of service. The flaw requires local user interaction to open a crafted SGI image file. No integrity or confidentiality impact is reported, only availability is affected. The vulnerability is rated medium severity with a CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). No official fix or patch is currently confirmed. The vendor advisory from Red Hat recommends not opening SGI files from untrusted sources as mitigation.
Potential Impact
The vulnerability causes a denial of service by crashing the GIMP file-sgi plugin when processing a maliciously crafted RLE-compressed SGI image. There is no impact on confidentiality or integrity. The crash results from an integer overflow during memory allocation, leading to undefined behavior and plugin abort. Exploitation requires user interaction to open a crafted file, reducing likelihood. No known exploits in the wild have been reported.
Mitigation Recommendations
According to the Red Hat advisory, no official patch or fix is currently available. The recommended mitigation is to avoid opening SGI image files from untrusted or unverified sources with GIMP. Users should exercise caution and only process trusted SGI files until a fix is released. Monitor the vendor advisory for updates on patch availability.
CVE-2026-66757: Integer Overflow or Wraparound in GNOME GIMP
Description
A flaw was found in the file-sgi plugin in GIMP. When processing an RLE-compressed SGI image, the plugin allocates memory for a row table. The image header dimensions (ysize and zsize) are read as 16-bit unsigned integers. If a crafted file sets both dimensions to their maximum value (65535), the multiplication ysize * zsize overflows the standard 32-bit int boundary before being passed to calloc. This integer overflow issue results in undefined behavior, aborting the plugin and causing a denial of service.
CVSS v3.1
Score 5.5medium
Affected software
GNOME
GIMP
Red Hat
Red Hat Enterprise Linux 6
Red Hat
Red Hat Enterprise Linux 7
Red Hat
Red Hat Enterprise Linux 8
Red Hat
Red Hat Enterprise Linux 9
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in the file-sgi plugin of GIMP, which processes RLE-compressed SGI images. The plugin reads the ysize and zsize dimensions as 16-bit unsigned integers. When both are set to 65535, their multiplication overflows a 32-bit integer boundary before being passed to calloc for memory allocation. This integer overflow leads to undefined behavior, causing the plugin to abort and resulting in a denial of service. The flaw requires local user interaction to open a crafted SGI image file. No integrity or confidentiality impact is reported, only availability is affected. The vulnerability is rated medium severity with a CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). No official fix or patch is currently confirmed. The vendor advisory from Red Hat recommends not opening SGI files from untrusted sources as mitigation.
Potential Impact
The vulnerability causes a denial of service by crashing the GIMP file-sgi plugin when processing a maliciously crafted RLE-compressed SGI image. There is no impact on confidentiality or integrity. The crash results from an integer overflow during memory allocation, leading to undefined behavior and plugin abort. Exploitation requires user interaction to open a crafted file, reducing likelihood. No known exploits in the wild have been reported.
Mitigation Recommendations
According to the Red Hat advisory, no official patch or fix is currently available. The recommended mitigation is to avoid opening SGI image files from untrusted or unverified sources with GIMP. Users should exercise caution and only process trusted SGI files until a fix is released. Monitor the vendor advisory for updates on patch availability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-07-27T17:24:27.249Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-66757","vendor":"Red Hat"}]
Threat ID: 6a67b0129c2644c7f8ad2d2d
Added to database: 07/27/2026, 19:22:58 UTC
Last enriched: 08/06/2026, 16:46:51 UTC
Last updated: 09/10/2026, 20:02:42 UTC
Views: 98
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