CVE-2026-44805 Microsoft CVE debrief

Who should care

Administrators of Windows Server 2019, Windows Server 2022, and Windows Server 2025 systems should be aware of this vulnerability, as it can be exploited locally by an authorized attacker to deny service.

Technical summary

The vulnerability is caused by a use-after-free error in the Windows Network Controller (NC) Host Agent. This allows an authorized attacker to exploit the vulnerability locally, potentially leading to a denial-of-service condition. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 5.5, indicating a medium severity level.

Defensive priority

This vulnerability has a medium severity rating and can be exploited locally by an authorized attacker. Therefore, administrators should prioritize patching this vulnerability, especially if the affected systems are exposed to local attacks.

Recommended defensive actions

• Apply the patches provided by Microsoft to vulnerable systems.
• Ensure that only authorized personnel have local access to affected systems.
• Monitor system logs for potential exploitation attempts.

Evidence notes

The vulnerability is tracked as CVE-2026-44805 and has been analyzed by the National Vulnerability Database (NVD). Microsoft has provided a vendor advisory for this vulnerability.

Official resources