CVE-2026-20831

High · 7.0

CVSS

7.0

EPSS

0.3%

Published

Jan 13, 2026

CISA due date

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The record

Time-of-check time-of-use (toctou) race condition in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Affected packages

Ecosystem	Package	Introduced	Fixed