CVE-2026-85841: Windows DHCP Server Remote Code Execution Vulnerability
Use after free in Windows DHCP Server allows an authorized attacker to execute code over a network.
Other sources
Windows DHCP Server Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655
Event History
Frequently Asked Questions
Who can exploit this vulnerability?
An attacker must already be authorized and have high privileges, and must be able to reach the Windows DHCP Server over the network. The attack complexity is high and no user interaction is required.
Which systems should be prioritized for review?
Review deployments running Windows DHCP Server on the listed Microsoft Windows versions: Windows 10; Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. The provided data does not identify affected builds, configurations, or fixed versions.
What is the potential impact of successful exploitation?
Successful exploitation can allow code execution and has high potential impact to confidentiality, integrity, and availability. The vulnerability is classified as a use-after-free issue.