Heap-based buffer overflow in Microsoft Windows - CVE-2026-113863
Published: November 11, 2026
Vulnerability identifier: #VU164961
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-113863
CWE-ID: CWE-122
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker on the local network to escalate privileges and execute arbitrary code with the privileges of the Windows DHCP Client service.
The vulnerability exists due to a heap-based buffer overflow in Windows DHCP Client when processing DHCP responses. A remote attacker on the local network can send a specially crafted response to an affected DHCP client to execute arbitrary code with the privileges of the DHCP Client service.
Affected software
Microsoft Windows
How to mitigate CVE-2026-113863
Install security update from vendor's website.
Microsoft Windows - addressed in versions 11 24H2 10.0.26100.9911, 11 24H2 10.0.26100.9974, 11 25H2 10.0.26200.9911, 11 25H2 10.0.26200.9974, 11 26H1 10.0.28000.3501