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CVE-2026-68820

High 7.0 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description

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

Metrics

CVSS 3.1
7.0 (HIGH) Score source: CNA CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS — exploit probability
9% (percentile: 95) as of 1 November 2026
CWE
CWE-416

Affected products

microsoft: windows 10 1607; microsoft: windows 10 1809; microsoft: windows 10 21h2; microsoft: windows 10 22h2; microsoft: windows 11 23h2; microsoft: windows 11 24h2; microsoft: windows 11 25h2; microsoft: windows 11 26h1; microsoft: windows server 2012; microsoft: windows server 2016; microsoft: windows server 2019; microsoft: windows server 2022; microsoft: windows server 2025

References