PT-2026-47865 · Microsoft · Windows 10 Version 1607+13

Published 2026-06-09 · Updated 2026-06-09 · CVE-2026-34335

NVD

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-34335

Affected Products

Windows 10 Version 1607

Windows 10 Version 1809

Windows 10 Version 21H2

Windows 10 Version 22H2

Windows 11 Version 23H2

Windows 11 Version 24H2

Windows 11 Version 25H2

Windows 11 Version 26H1

Windows Server 2012

Windows Server 2012 R2

Windows Server 2016

Windows Server 2019

Windows Server 2022

Windows Server 2025

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-34335 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34335 · Vendor Advisory