CVE-2026-42169 Red Hat CVE debrief

Who should care

Users of GIMP, especially those handling image files from untrusted sources, should be aware of this vulnerability and take steps to mitigate it. This includes applying patches, inventorying GIMP installations, and monitoring logs for suspicious activity. GIMP users should prioritize patching to prevent potential code execution. Vulnerability management and security teams should review compensating controls for exposed systems while remediation is scheduled and verified. Operators and platform administrators should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. GIMP users should also check relevant monitoring, detection, and logs for exposed assets that need extra review. Asset inventory and change management processes should be reviewed to ensure that GIMP installations are properly managed and updated. Additionally, users should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Compensating controls should be reviewed for exposed systems while remediation is scheduled and verified. Monitoring and detection capabilities should be checked for exposed assets that need extra review. GIMP users should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Source tracking and rollback/change windows should be considered for GIMP installations. Overall, GIMP users, operators, and security teams should take a comprehensive approach to mitigate this vulnerability and prevent potential code execution. This may involve coordinating with vendors, reviewing logs, and implementing compensating controls. By taking these steps, GIMP users can reduce the risk of exploitation and protect their systems from potential attacks. GIMP users should also consider implementing monitoring and detection capabilities to identify potential security incidents related to this vulnerability. This can include reviewing logs, monitoring network traffic, and implementing intrusion detection systems. By

Technical summary

A heap-buffer-overflow vulnerability exists in the APNG file loader of GIMP, occurring when the `fcTL` width exceeds the `IHDR` width. A heap-based buffer overflow also exists in the DDS plug-in due to a BPP mismatch in the `load_layer()` function. Both can be triggered by opening a specially crafted image file, potentially leading to code execution. GIMP users should prioritize patching to prevent potential code execution.

Defensive priority

GIMP users should prioritize patching to prevent potential code execution.

Recommended defensive actions

• Apply patches for GIMP to prevent potential code execution
• Inventory GIMP installations for potential exposure
• Monitor GIMP logs for suspicious activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record indicates a heap-buffer-overflow vulnerability in the APNG file loader of GIMP and a heap-based buffer overflow in the DDS plug-in. Limited details are available on affected scope and vendor remediation. Users should verify GIMP installations, review logs for suspicious activity, and monitor for potential exposure. Defensive measures should include applying patches, inventorying GIMP installations, and tracking exceptions.

Official resources