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PatchSiren cyber security CVE debrief

CVE-2026-66757 GNOME CVE debrief

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.

Vendor
GNOME
Product
GIMP
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-27
Original CVE updated
2026-08-10
Advisory published
2026-07-27
Advisory updated
2026-08-10

Who should care

Users of GIMP, especially those processing untrusted SGI images, should be aware of this vulnerability and take steps to mitigate it. This includes reviewing and applying patches from GIMP vendors, restricting access to untrusted SGI images, and monitoring for similar vulnerabilities in image processing plugins. IT teams and security professionals responsible for managing GIMP installations should prioritize this issue and ensure that their systems are updated and protected.

Technical summary

The file-sgi plugin in GIMP is vulnerable to an integer overflow when processing RLE-compressed SGI images. If a crafted file sets image header dimensions (ysize and zsize) to their maximum value (65535), the multiplication overflows the 32-bit int boundary before being passed to calloc, resulting in undefined behavior and a denial of service. This issue affects users of GIMP who process untrusted SGI images, particularly those in environments where image processing is common.

Defensive priority

Medium priority due to potential for denial of service

Recommended defensive actions

  • Review and apply patches from GIMP vendors
  • Restrict access to untrusted SGI images
  • Monitor for similar vulnerabilities in image processing plugins
  • Perform a thorough review of system logs for abnormal plugin behavior
  • Ensure that GIMP is updated to the latest version
  • Conduct an asset inventory to identify systems that may be exposed
  • Implement compensating controls for exposed systems while remediation is scheduled

Evidence notes

Evidence from official CVE and NVD sources indicate a potential integer overflow issue in GIMP's file-sgi plugin. Limited details are available on affected products and versions. To verify, defenders should review official advisories and assess their exposure to untrusted SGI images. Additional verification tasks may include reviewing system logs for abnormal plugin behavior and ensuring that GIMP is updated to the latest version.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-66757 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-66757

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-66757 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-66757

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.