CVE-2026-56187 in Windows
Summary
by MITRE • 07/14/2026
Use after free in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical use-after-free condition within the Windows MIDI service module that enables local privilege escalation for authenticated attackers. The flaw occurs when the system fails to properly validate memory references after objects have been freed, creating opportunities for malicious code execution in privileged contexts. The vulnerability stems from inadequate memory management practices within the multimedia subsystem where MIDI processing components maintain references to deallocated memory structures. Attackers with low-privilege user accounts can exploit this weakness by crafting specific MIDI data sequences that trigger the use-after-free scenario during normal system operation.
The technical implementation of this vulnerability involves manipulation of the Windows multimedia framework's MIDI service handling mechanisms. When legitimate MIDI input is processed through the affected service module, improper memory deallocation followed by subsequent access creates a race condition that allows attackers to control memory contents. This particular weakness maps to CWE-416 which specifically addresses use-after-free vulnerabilities in software systems. The attack vector requires local system access and authentication, making it suitable for exploitation within insider threat scenarios or after initial compromise through other attack vectors. The vulnerability exists in the kernel-mode components of Windows operating systems where multimedia services operate with elevated privileges.
The operational impact of this privilege escalation vulnerability extends beyond simple code execution capabilities to encompass complete system compromise potential. Once successfully exploited, attackers can gain SYSTEM level privileges which provide unrestricted access to all system resources, user data, and network communications. This elevation allows for persistent backdoor installation, credential harvesting, lateral movement across networks, and data exfiltration activities. The vulnerability affects multiple Windows versions including windows 10, windows server 2016, and related operating systems where the affected MIDI service module remains active. Security researchers have noted that exploitation typically requires minimal user interaction beyond system authentication, making this vector particularly concerning for enterprise environments.
Mitigation strategies should focus on immediate patch deployment through Microsoft security updates which address the memory management flaws in the affected components. System administrators must prioritize patching across all affected Windows installations while implementing additional protective measures such as disabling unnecessary multimedia services and restricting user privileges where possible. Network segmentation and monitoring controls should be enhanced to detect anomalous MIDI service behavior or unauthorized privilege escalation attempts. The ATT&CK framework identifies this vulnerability under T1068 which covers privilege escalation techniques, specifically targeting local system services and kernel-mode exploits. Organizations should also consider implementing application whitelisting policies to restrict execution of potentially malicious code through multimedia processing pathways while maintaining proper audit logging for detection purposes.