MICROSOFT-CVE-2026-34344

HIGH7.8

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Published May 12, 2026

Modified 5 days ago

Details

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

References

ADVISORY

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34344

CVSS Analysis

CVSS v2.0

7.8

Upstream

CVE-2026-34344

Ecosystems

Timeline

PublishedMay 12, 2026

ModifiedMay 14, 2026