cve 2026 56159

The cve 2026 56159 tag covers Microsoft’s critical remote-code-execution vulnerability in the Windows DHCP Server service. The flaw is described as a heap-based buffer overflow that can be exploited over a network without authentication or user interaction, potentially allowing code execution on infrastructure that assigns network configurations to clients. This archive focuses on the Microsoft Security Response Center disclosure, the maximum-impact CVSS 3.1 assessment recorded by the National Vulnerability Database, and the required remediation. Administrators running Microsoft DHCP should review and deploy the July 14, 2026 security updates promptly to reduce exposure and protect affected Windows network services.