CVE-2026-26177

| EUVD-2026-22416 HIGH
2026-04-14 microsoft GHSA-35fw-6mhj-pxpw
Denial Of Service Use After Free Memory Corruption Microsoft Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows 11 Version 22H3 Windows 11 Version 23H2 Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H1 Windows Server 2012 Windows Server 2012 Server Core Installation Windows Server 2012 R2 Windows Server 2012 R2 Server Core Installation Windows Server 2016 Windows Server 2016 Server Core Installation Windows Server 2019 Windows Server 2019 Server Core Installation Windows Server 2022 Windows Server 2022 23H2 Edition Server Core Installation Windows Server 2025 Windows Server 2025 Server Core Installation
7.0
CVSS 3.1
Temporal: 6.1
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CVSS VectorNVD

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
Analysis Generated
Apr 14, 2026 - 19:27 vuln.today

DescriptionNVD

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

AnalysisAI

Local privilege escalation in Windows Ancillary Function Driver for WinSock affects all supported Windows 10, 11, and Server versions through use-after-free memory corruption. Authenticated local attackers with low privileges can exploit this CWE-416 vulnerability to gain SYSTEM-level access, achieving high impact to confidentiality, integrity, and availability. …

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RemediationAI

Within 24 hours: Inventory all Windows 10, 11, and Server systems; identify patch version from vendor advisory and validate availability in your environment. Within 7 days: Deploy vendor-released patch to 100% of endpoints, prioritizing servers and privileged workstations; test patch in non-production environment first. …

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CVE-2026-26177 vulnerability details – vuln.today
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