Use After Free in Microsoft Windows Server 2019
CVE-2026-44805
Use after free in Windows Network Controller (NC) Host Agent allows an authorized attacker to deny service locally.
Vulnerability class: Use-After-Free
EPSS: 0.004 (28.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Microsoft Windows Server 2019 — versions 10.0.17763.0
- Microsoft Windows_server_2019
- Microsoft Windows Server 2019 (Server Core Installation) — versions 10.0.17763.0
- Microsoft Windows Server 2022 — versions 10.0.20348.0
- Microsoft Windows_server_2022
- Microsoft Windows Server 2025 — versions 10.0.26100.0
- Microsoft Windows_server_2025
- Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44805?
- CVE-2026-44805 is a medium-severity vulnerability in Microsoft Windows Server 2019, classified under Use After Free. CVSS score: 5.5/10. Published 2026-06-09.
- How severe is CVE-2026-44805?
- Medium severity. CVSS v3 base score is 5.5 out of 10.