Integer underflow in Windows and Windows Server - CVE-2026-49181
Published: July 17, 2026
Vulnerability identifier: #VU137964
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-49181
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a remote attacker to escalate privileges.
The vulnerability exists due to integer underflow in Windows DHCP Client when handling network traffic. A remote attacker can send specially crafted network traffic to escalate privileges.
Successful exploitation could result in SYSTEM privileges.
How to mitigate CVE-2026-49181
Install security update from vendor's website.