CVE-2026-34344

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: May 12, 2026
Source updated: Aug 10, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Windows 10 Version 1607

Vendor: Microsoft
Product: Windows 10 Version 1607
Platforms: 32-bit Systems
x64-based Systems
Default status: Unknown

Windows 10 Version 1607 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.14393.0	`affected`	custom	10.0.14393.9140	Unavailable	None listed

Windows 10 Version 1809

Vendor: Microsoft
Product: Windows 10 Version 1809
Platforms: 32-bit Systems
x64-based Systems
Default status: Unknown

Windows 10 Version 1809 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.17763.0	`affected`	custom	10.0.17763.8755	Unavailable	None listed

Windows 10 Version 21H2

Vendor: Microsoft
Product: Windows 10 Version 21H2
Platforms: 32-bit Systems
ARM64-based Systems
x64-based Systems
Default status: Unknown

Windows 10 Version 21H2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.19044.0	`affected`	custom	10.0.19044.7291	Unavailable	None listed

Windows 10 Version 22H2

Vendor: Microsoft
Product: Windows 10 Version 22H2
Platforms: 32-bit Systems
ARM64-based Systems
x64-based Systems
Default status: Unknown

Windows 10 Version 22H2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.19045.0	`affected`	custom	10.0.19045.7417	Unavailable	None listed

Windows 11 version 23H2

Vendor: Microsoft
Product: Windows 11 version 23H2
Platforms: ARM64-based Systems
Default status: Unknown

Windows 11 version 23H2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.22631.0	`affected`	custom	10.0.22631.7079	Unavailable	None listed

Windows 11 Version 23H2

Vendor: Microsoft
Product: Windows 11 Version 23H2
Platforms: x64-based Systems
Default status: Unknown

Windows 11 Version 23H2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.22631.0	`affected`	custom	10.0.22631.7219	Unavailable	None listed

Windows 11 Version 24H2

Vendor: Microsoft
Product: Windows 11 Version 24H2
Platforms: ARM64-based Systems
x64-based Systems
Default status: Unknown

Windows 11 Version 24H2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.26100.0	`affected`	custom	10.0.26100.8457	Unavailable	None listed

Windows 11 Version 25H2

Vendor: Microsoft
Product: Windows 11 Version 25H2
Platforms: ARM64-based Systems
x64-based Systems
Default status: Unknown

Windows 11 Version 25H2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.26200.0	`affected`	custom	10.0.26200.8457	Unavailable	None listed

Windows 11 version 26H1

Vendor: Microsoft
Product: Windows 11 version 26H1
Platforms: ARM64-based Systems
x64-based Systems
Default status: Unknown

Windows 11 version 26H1 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.28000.0	`affected`	custom	10.0.28000.2113	Unavailable	None listed

Windows Server 2012

Vendor: Microsoft
Product: Windows Server 2012
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2012 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.2.9200.0	`affected`	custom	6.2.9200.26079	Unavailable	None listed

Windows Server 2012 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2012 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2012 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.2.9200.0	`affected`	custom	6.2.9200.26079	Unavailable	None listed

Windows Server 2012 R2

Vendor: Microsoft
Product: Windows Server 2012 R2
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2012 R2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.3.9600.0	`affected`	custom	6.3.9600.23181	Unavailable	None listed

Windows Server 2012 R2 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2012 R2 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2012 R2 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.3.9600.0	`affected`	custom	6.3.9600.23181	Unavailable	None listed

Windows Server 2016

Vendor: Microsoft
Product: Windows Server 2016
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2016 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.14393.0	`affected`	custom	10.0.14393.9140	Unavailable	None listed

Windows Server 2016 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2016 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2016 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.14393.0	`affected`	custom	10.0.14393.9140	Unavailable	None listed

Windows Server 2019

Vendor: Microsoft
Product: Windows Server 2019
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2019 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.17763.0	`affected`	custom	10.0.17763.8755	Unavailable	None listed

Windows Server 2019 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2019 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2019 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.17763.0	`affected`	custom	10.0.17763.8755	Unavailable	None listed

Windows Server 2022

Vendor: Microsoft
Product: Windows Server 2022
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2022 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.20348.0	`affected`	custom	10.0.20348.5139	Unavailable	None listed

Windows Server 2022, 23H2 Edition (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2022, 23H2 Edition (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2022, 23H2 Edition (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.25398.0	`affected`	custom	10.0.25398.2330	Unavailable	None listed

Windows Server 2025

Vendor: Microsoft
Product: Windows Server 2025
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2025 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.26100.0	`affected`	custom	10.0.26100.32860	Unavailable	None listed

Windows Server 2025 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2025 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2025 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.26100.0	`affected`	custom	10.0.26100.32860	Unavailable	None listed