CVE-2026-59090 Red Hat CVE debrief

Who should care

Users of GIMP, especially those who handle `.psd` image files from untrusted sources, should be aware of this vulnerability and take steps to mitigate it. This includes applying patches or updates provided by the vendor, restricting access to untrusted `.psd` image files, and monitoring systems for suspicious activity. IT teams and security professionals responsible for managing GIMP installations should prioritize patching and ensure that proper security measures are in place to protect against potential exploitation.

Technical summary

The vulnerability is caused by an unsigned integer underflow in the `block_rem` variable of GIMP's PSD file format plugin. This underflow occurs when a user opens a specially crafted `.psd` image file, leading to parser confusion and allowing an attacker to inject arbitrary data as layer resource blocks, potentially resulting in arbitrary code execution. The plugin does not properly validate the `block_rem` variable, leading to this vulnerability. Users should exercise caution when handling `.psd` files from untrusted sources.

Defensive priority

High priority due to potential for arbitrary code execution

Recommended defensive actions

• Apply patches or updates provided by the vendor
• Restrict access to untrusted `.psd` image files
• Monitor systems for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Evidence from the NVD and Red Hat security advisories indicates a vulnerability in GIMP's PSD file format plugin. The vulnerability allows for arbitrary code execution when a specially crafted `.psd` image file is opened. Further review of the plugin's code and additional testing are recommended to fully understand the scope and impact of this vulnerability. Defenders should verify that systems handling `.psd` files are properly patched and monitor for suspicious activity.

Official resources