CVE-2026-58594

Microsoft · Windows

An integer overflow or wraparound vulnerability in Windows RDP allows an unauthorized attacker to execute arbitrary code over a network.

Executive summary

A critical integer overflow vulnerability in Windows RDP allows for remote code execution, necessitating urgent patching across affected Windows environments.

Vulnerability

This vulnerability resides in the Windows Remote Desktop Protocol (RDP) stack, where an integer overflow or wraparound condition can be triggered. An unauthorized attacker can leverage this over a network to achieve remote code execution, typically involving user interaction.

Business impact

Remote code execution in the RDP stack is a critical risk, as it provides an attacker with the ability to run arbitrary commands with the privileges of the logged-in user. With a CVSS score of 8.8, this vulnerability could lead to total system compromise, ransomware deployment, or the exfiltration of sensitive data from affected machines.

Remediation

Immediate Action: Deploy the latest cumulative security updates for all affected versions of Windows 10 and 11 immediately.

Proactive Monitoring: Monitor network traffic for anomalous RDP activity and check system logs for signs of unexpected process execution.

Compensating Controls: Restrict access to RDP services to trusted networks only, preferably behind a VPN or through an RD Gateway with multi-factor authentication.

Exploitation status

Public Exploit Available: Unknown

Analyst recommendation

Due to the nature of RDP as a primary attack vector, this vulnerability must be treated with the highest level of urgency. Administrators should prioritize patching all exposed Windows endpoints to prevent potential remote code execution attacks against their infrastructure.