High MSRC-CVE-2026-118739 1 CVE

Windows DHCP Client Denial of Service Vulnerability

Published Nov 10, 2026 · Updated Nov 10, 2026

Vendor: Microsoft

Summary

Impact: Denial of Service. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

Security updates
10.0.26100.9168 — https://support.microsoft.com/help/5121003
10.0.26100.9106 — https://support.microsoft.com/help/5120994
10.0.26100.33296 — https://support.microsoft.com/help/5120233
10.0.26100.33222 — https://support.microsoft.com/help/5120228
10.0.28000.2704 — https://support.microsoft.com/help/5121000

Vulnerabilities 1

Medium 6.5

CVE-2026-118739

Windows DHCP Client Denial of Service Vulnerability

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

Microsoft Windows Server 2025 Windows Server 2025 (Server Core installation) Windows 11 Version 24H2 Windows

Nov 10, 2026

Revision history

2026-11-10 #1
Information published.

References

CVE-2026-118739 Windows DHCP Client Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118739
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss