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CVE-2026-118739ImportantDoSAdjacent

Windows DHCP Client Denial of Service Vulnerability

MSRC advisory NVD CVE.org

Assessment

Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over an adjacent network.

Severity
Important
CVSS base score
6.5
Impact
Denial of Service
Exploitation detected
No known exploitation (MSRC assessment)
Exploitability
Exploitation Less Likely
Publicly disclosed
No (MSRC assessment)
EPSS · 30-day forecast
No EPSS score collected
Customer action
Required: follow the MSRC remediation guidance
More details
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Public detection template
No Nuclei template is listed in the current collected catalog
Component
Windows DHCP Client
Weakness
CWE-401: Missing Release of Memory after Effective Lifetime
Issued by
Microsoft
Published
10 Nov 2026 · November 2026
Last revised
10 Nov 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
AdjacentAV:A
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
NoneC:N
Integrity
NoneI:N
Availability
HighA:H

Updates that fix it

5 KBs
KBTypeRestartApplies toOther CVEs
KB5120228 Security Hotpatch Update—Windows Server 2025, Windows Server 2025 (Server Core installation)All CVEs in KB5120228
KB5120233 Security UpdateRequiredWindows Server 2025, Windows Server 2025 (Server Core installation)All CVEs in KB5120233
KB5120994 Security Hotpatch Update—Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 1 moreAll CVEs in KB5120994
KB5121000 Security UpdateRequiredWindows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based SystemsAll CVEs in KB5121000
KB5121003 Security UpdateRequiredWindows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 1 moreAll CVEs in KB5121003

Affected products

Windows
8 affected products
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An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

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