CVE-2026-40918 Red Hat CVE debrief

Who should care

System administrators and developers who process untrusted PVR image files using GIMP should assess exposure and implement defensive measures to prevent DoS. This includes verifying GIMP's configuration, restricting untrusted input, and monitoring systems for crashes or unusual behavior. Additionally, reviewing compensating controls and tracking exceptions are crucial for ensuring the security of affected systems.

Why it matters

CVE-2026-40918 is a medium-severity vulnerability in GIMP's PVR image loader that can cause a denial of service (DoS) when processing specially crafted PVR image files. System administrators and developers processing untrusted PVR image files should assess exposure and implement defensive measures.

• Potential denial of service (DoS) due to application crashes
• Need for input validation and restricted untrusted input
• Verification of GIMP configuration and remediation steps required

Technical summary

The GIMP PVR image loader is vulnerable to a denial of service (DoS) when processing specially crafted PVR image files with large dimensions. This occurs due to a stack-based buffer overflow and an out-of-bounds read, causing the application to crash. The vulnerability has a medium severity and can be exploited by processing malicious PVR image files, leading to potential application crashes and denial of service. It is essential for system administrators and developers to assess their exposure and implement defensive measures.

Defensive priority

Medium-priority defensive actions are recommended for systems processing untrusted PVR image files, as a DoS can occur. Verify GIMP's configuration and restrict untrusted input.

Recommended defensive actions

• Verify GIMP's configuration to restrict untrusted input
• Implement input validation for PVR image files
• Monitor systems for crashes or unusual behavior
• 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

The CVE record and NVD entry provide details on the vulnerability. However, specific version information and remediation steps are not provided in the source corpus. The vulnerability is confirmed to exist in GIMP's PVR image loader, and its exploitation can lead to a denial of service. Further verification of GIMP's configuration and input validation for PVR image files is recommended. The lack of specific version information necessitates a thorough review of the system's GIMP configuration and implementation of defensive measures.

Sources and 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.