CVE-2026-26182: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Published Apr 14, 2026
·
Updated

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Other sources

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Microsoft

Affected Software

57 affected componentsFixes available
Microsoft Windows 11=26H1
Microsoft Windows Server 2012
Microsoft Windows Server 2012 R2
Microsoft Windows Server 2012
Microsoft Windows Server 2012 R2
Microsoft Windows Server 2016
Microsoft Windows 11=26H1
Microsoft Windows Server 2025
Microsoft Windows 10=1607
Microsoft Windows 10=1607
Microsoft Windows Server 2022, 23H2 Edition
Microsoft Windows Server 2016
Microsoft Windows 11=23H2
Microsoft Windows 11=23H2
Microsoft Windows 10=22H2
Microsoft Windows 10=22H2
Microsoft Windows 11=25H2
Microsoft Windows 10=21H2
Microsoft Windows Server 2025
Microsoft Windows 10=21H2
Microsoft Windows 10=21H2
Microsoft Windows Server 2022
Microsoft Windows 10=22H2
Microsoft Windows Server 2022
Microsoft Windows Server 2019
Microsoft Windows Server 2019
Microsoft Windows 10=1809
Microsoft Windows 10=1809
Microsoft Windows Ancillary Function Driver for WinSock
Microsoft Windows 11=24H2
Microsoft Windows 11=24H2
Microsoft Windows 11=25H2
Microsoft Windows 10 1607<10.0.14393.9060
Microsoft Windows 10 1607<10.0.14393.9060
Microsoft Windows 10 1809<10.0.17763.8644
Microsoft Windows 10 1809<10.0.17763.8644
Microsoft Windows 10 21h2<10.0.19044.7184
Microsoft Windows 10 21h2<10.0.19044.7184
Microsoft Windows 10 21h2<10.0.19044.7184
Microsoft Windows 10 22h2<10.0.19045.7184
Microsoft Windows 10 22h2<10.0.19045.7184
Microsoft Windows 10 22h2<10.0.19045.7184
Microsoft Windows 11 23h2<10.0.22631.6936
Microsoft Windows 11 23h2<10.0.22631.6936
Microsoft Windows 11 24h2<10.0.26100.8246
Microsoft Windows 11 24h2<10.0.26100.8246
Microsoft Windows 11 25h2<10.0.26200.8246
Microsoft Windows 11 25h2<10.0.26200.8246
Microsoft Windows 11 26h1<10.0.28000.1836
Microsoft Windows 11 26h1<10.0.28000.1836
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016<10.0.14393.9060
Microsoft Windows Server 2019<10.0.17763.8644
Microsoft Windows Server 2022<10.0.20348.5020
Microsoft Windows Server 2022 23h2<10.0.25398.2274
Microsoft Windows Server 2025<10.0.26100.32690

Event History

Apr 14, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
Updated
via Microsoft·02:00 PM
Affected Software
CVE Published
via MITRE·04:58 PM
Data Sourced
via MITRE·04:58 PM
DescriptionSeverity
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-26182?

CVE-2026-26182 is rated as a critical elevation of privilege vulnerability in the Windows Ancillary Function Driver for WinSock.

2

How do I fix CVE-2026-26182?

To fix CVE-2026-26182, apply the latest updates and patches provided by Microsoft for the affected versions of Windows.

3

Which versions of Windows are affected by CVE-2026-26182?

CVE-2026-26182 affects various versions of Windows including Windows 11, Windows Server 2012, and Windows Server 2016.

4

Can CVE-2026-26182 be exploited remotely?

CVE-2026-26182 requires local access to the system to be exploited, meaning it cannot be exploited remotely.

5

What are the potential impacts of CVE-2026-26182?

If successfully exploited, CVE-2026-26182 could allow an attacker to gain elevated privileges on the affected Windows system.

Contact

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