CRITICAL 9.8 Microsoft

CVE-2026-56159

DHCP Server Service Remote Code Execution Vulnerability

Microsoft Security Update 2026-Jul: DHCP Server Service Remote Code Execution Vulnerability

Affected Products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2025 (Server Core installation)
Windows Server 2025
Windows 10 Version 1607 for 32-bit Systems

References

Published: 2026-07-14 · Source: Microsoft · Feed updated: 2026-09-18

This critical severity vulnerability with a CVSS score of 9.8 was published on 2026-07-14 via Microsoft. Affected: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 5 more.

Risk Timeline

CVE Disclosed2026-07-14 · 65 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56159

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2026-56159

Related Vulnerabilities

CVE	Title	Severity	CVSS
CVE-2026-57092	Microsoft Windows VMSwitch Elevation of Privilege Vulnerability	CRITICAL	9.9
CVE-2026-68839	Windows USB Mass Storage Class Driver Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-69276	Microsoft UxTheme Library (uxtheme.dll) Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-69408	Microsoft Windows Media Foundation Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-69431	Telnet Client Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2026-69463	Windows NTFS Remote Code Execution Vulnerability	CRITICAL	9.8

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