Use After Free in Microsoft Windows 10 Version 1607
CVE-2026-78446
Use after free in Windows Distributed File System (DFS) allows an authorized attacker to deny service over a network.
Vulnerability class: Use-After-Free
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1809
- Microsoft Windows 10 Version 21h2
- Microsoft Windows 10 Version 22h2
- Microsoft Windows 11 Version 23h2
- Microsoft Windows 11 Version 24h2
- Microsoft Windows 11 Version 25h2
- Microsoft Windows 11 Version 26h1
- Microsoft Windows Server 2012
- Microsoft Windows Server 2012 R2
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-78446?
- CVE-2026-78446 is a medium-severity vulnerability in Microsoft Windows 10 Version 1607, classified under Use After Free. CVSS score: 5.3/10. Published 2026-09-08.
- How severe is CVE-2026-78446?
- Medium severity. CVSS v3 base score is 5.3 out of 10.