Stack-based buffer overflow in Windows Server - CVE-2026-41089
Published: May 13, 2026 / Updated: June 23, 2026
Vulnerability identifier: #VU131312
CSH Severity: Critical
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/U:Red
CVE-ID: CVE-2026-41089
CWE-ID: CWE-121
Exploitation vector: Adjecent network
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: Microsoft
Affected software:
Windows Server
Windows Server
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in Windows Netlogon. A remote unauthenticated attacker can send specially crafted network request to a domain controller server, trigger a stack-based buffer overflow and execute arbitrary code with SYSTEM privileges.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system and the entire AD.
How to mitigate CVE-2026-41089
Install updates from vendor's website.