CVE-2026-78446: windows 10 1607 before 10.0.14393.9512 (exclusive); +31 more affected products

Affected technology

windows 10 1607 · before 10.0.14393.9512 (exclusive)
microsoft

windows 10 1809 · before 10.0.17763.9245 (exclusive)
microsoft

windows 10 21h2 · before 10.0.19044.7725 (exclusive)
microsoft

windows 10 22h2 · before 10.0.19045.7725 (exclusive)
microsoft

windows 11 23h2 · before 10.0.22631.7582 (exclusive)
microsoft

windows 11 24h2 · before 10.0.26100.9445 (exclusive)
microsoft

windows 11 25h2 · before 10.0.26200.9445 (exclusive)
microsoft

windows 11 26h1 · before 10.0.28000.2954 (exclusive)
microsoft

windows server 2012 · Version not applicable in the source CPE
microsoft

windows server 2012 · r2
microsoft

windows server 2016 · before 10.0.14393.9512 (exclusive)
microsoft

windows server 2019 · before 10.0.17763.9245 (exclusive)
microsoft

windows server 2022 · before 10.0.20348.5622 (exclusive)
microsoft

windows server 2025 · before 10.0.26100.33438 (exclusive)
microsoft

Windows 10 Version 1607 · 10.0.14393.0 to before 10.0.14393.9512
Microsoft

Windows 10 Version 1809 · 10.0.17763.0 to before 10.0.17763.9245
Microsoft

Windows 10 Version 21H2 · 10.0.19044.0 to before 10.0.19044.7725
Microsoft

Windows 10 Version 22H2 · 10.0.19045.0 to before 10.0.19045.7725
Microsoft

Windows 11 version 23H2 · 10.0.22631.0 to before 10.0.22631.7582
Microsoft

Windows 11 Version 24H2 · 10.0.26100.0 to before 10.0.26100.9445
Microsoft

Windows 11 Version 25H2 · 10.0.26200.0 to before 10.0.26200.9445
Microsoft

Windows 11 version 26H1 · 10.0.28000.0 to before 10.0.28000.2954
Microsoft

Windows Server 2012 · 6.2.9200.0 to before 6.2.9200.26349
Microsoft

Windows Server 2012 (Server Core installation) · 6.2.9200.0 to before 6.2.9200.26349
Microsoft

Windows Server 2012 R2 · 6.3.9600.0 to before 6.3.9600.23398
Microsoft

Windows Server 2012 R2 (Server Core installation) · 6.3.9600.0 to before 6.3.9600.23398
Microsoft

Windows Server 2016 · 10.0.14393.0 to before 10.0.14393.9512
Microsoft

Windows Server 2016 (Server Core installation) · 10.0.14393.0 to before 10.0.14393.9512
Microsoft

Windows Server 2019 · 10.0.17763.0 to before 10.0.17763.9245
Microsoft

Windows Server 2019 (Server Core installation) · 10.0.17763.0 to before 10.0.17763.9245
Microsoft

Windows Server 2022 · 10.0.20348.0 to before 10.0.20348.5622
Microsoft

Windows Server 2025 · 10.0.26100.0 to before 10.0.26100.33438
Microsoft

Windows Server 2025 (Server Core installation) · 10.0.26100.0 to before 10.0.26100.33438
Microsoft

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

The source says use after free in Windows Distributed File System (DFS) allows an authorized attacker to execute code over a network. Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality, integrity and availability impact as high.