CVE-2026-44805 Windows Network Controller (NC) Host Agent Denial of Service Vulnerability
An authorized local attacker can cause a denial of service in the Windows Network Controller Host Agent via a use-after-free vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44805?
CVE-2026-44805 is a medium-severity use after free vulnerability in Microsoft Windows Server 2019, published on 9 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Use after free in Windows Network Controller (NC) Host Agent allows an authorized attacker to deny service locally.
Which versions are affected by CVE-2026-44805?
It affects 3 products.
Products include Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-44805?
No fix has been published for CVE-2026-44805 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-44805 being exploited?
There is no known exploitation of CVE-2026-44805 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2019
- CVE-2026-88102 Microsoft Failover Cluster Remote Code Execution Vulnerability
- CVE-2026-102192 Windows Failover Cluster Denial of Service Vulnerability
- CVE-2026-69577 Microsoft Azure Attestation service and Device Health Attestation Service Information Disclosure Vulnerability
- CVE-2026-96945 Windows Failover Cluster Denial of Service Vulnerability
- CVE-2026-21243 Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability
Sources
Also known as GHSA-hr83-xf6f-c3j7.