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CVE-2026-78446: CWE-416: Use After Free in Microsoft Windows 10 Version 1607

0
High
VulnerabilityCVE-2026-78446cvecve-2026-78446cwe-416
Published: 09/08/2026 (09/08/2026, 17:18:22 UTC)
Source: CVE Database V5
Vendor/Project: Microsoft
Product: Windows 10 Version 1607

Description

Use after free in Windows Distributed File System (DFS) allows an authorized attacker to execute code over a network.

CVSS v3.1

Score 7.5high

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Affected software

Microsoft

Windows 10 Version 1607

Affected versions
>=10.0.14393.0 <10.0.14393.9512

Microsoft

Windows 10 Version 1809

Affected versions
>=10.0.17763.0 <10.0.17763.9245

Microsoft

Windows 10 Version 21H2

Affected versions
>=10.0.19044.0 <10.0.19044.7725

Microsoft

Windows 10 Version 22H2

Affected versions
>=10.0.19045.0 <10.0.19045.7725

Microsoft

Windows 11 version 23H2

Affected versions
>=10.0.22631.0 <10.0.22631.7582

Microsoft

Windows 11 Version 23H2

Affected versions
>=10.0.22631.0 <10.0.22631.7582

Microsoft

Windows 11 Version 24H2

Affected versions
>=10.0.26100.0 <10.0.26100.9445

Microsoft

Windows 11 Version 25H2

Affected versions
>=10.0.26200.0 <10.0.26200.9445

Microsoft

Windows 11 version 26H1

Affected versions
>=10.0.28000.0 <10.0.28000.2954

Microsoft

Windows Server 2012

Affected versions
>=6.2.9200.0 <6.2.9200.26349

Microsoft

Windows Server 2012 (Server Core installation)

Affected versions
>=6.2.9200.0 <6.2.9200.26349

Microsoft

Windows Server 2012 R2

Affected versions
>=6.3.9600.0 <6.3.9600.23398

Microsoft

Windows Server 2012 R2 (Server Core installation)

Affected versions
>=6.3.9600.0 <6.3.9600.23398

Microsoft

Windows Server 2016

Affected versions
>=10.0.14393.0 <10.0.14393.9512

Microsoft

Windows Server 2016 (Server Core installation)

Affected versions
>=10.0.14393.0 <10.0.14393.9512

Microsoft

Windows Server 2019

Affected versions
>=10.0.17763.0 <10.0.17763.9245

Microsoft

Windows Server 2019 (Server Core installation)

Affected versions
>=10.0.17763.0 <10.0.17763.9245

Microsoft

Windows Server 2022

Affected versions
>=10.0.20348.0 <10.0.20348.5622

Microsoft

Windows Server 2025

Affected versions
>=10.0.26100.0 <10.0.26100.33438

Microsoft

Windows Server 2025 (Server Core installation)

Affected versions
>=10.0.26100.0 <10.0.26100.33438

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/14/2026, 22:00:04 UTC

Technical Analysis

This vulnerability (CVE-2026-78446) involves a use-after-free condition in the Windows Distributed File System (DFS) component. Exploitation requires an attacker with some level of authorization to execute code remotely over a network. The vulnerability affects multiple Windows 10 versions, including 1607 and later builds up to specified update versions. Microsoft has published an official fix for this issue.

Potential Impact

Successful exploitation of this vulnerability could allow an authorized attacker to execute arbitrary code remotely, potentially leading to full system compromise. The vulnerability impacts confidentiality, integrity, and availability as indicated by the CVSS vector (C:H/I:H/A:H). No known exploits are reported in the wild at this time.

Mitigation Recommendations

An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78446 to remediate this vulnerability.

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Technical Details

Data Version
5.2
Assigner Short Name
microsoft
Date Reserved
2026-08-24T16:21:50.286Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
official-fix
Vendor Advisory Urls
[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78446","vendor":"Microsoft"}]

Threat ID: 6aa0455facd9273b49faa135

Added to database: 09/08/2026, 17:26:55 UTC

Last enriched: 10/14/2026, 22:00:04 UTC

Last updated: 10/21/2026, 13:40:30 UTC

Views: 22

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