Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-41096
Published: May 13, 2026
Vulnerability identifier: #VU131296
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41096
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in Windows DNS Client. A remote attacker can send a specially crafted DNS response, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-41096
Install updates from vendor's website.
Microsoft Windows - addressed in versions 11 23H2 10.0.22631.7079, 11 24H2 10.0.26100.8390, 11 24H2 10.0.26100.8457, 11 25H2 10.0.26200.8390, 11 25H2 10.0.26200.8457, 11 26H1 10.0.28000.2113
Windows Server - addressed in versions 2022 23H2 10.0.25398.2330, 2025 10.0.26100.32772, 2025 10.0.26100.32860
Windows Server - addressed in versions 2022 23H2 10.0.25398.2330, 2025 10.0.26100.32772, 2025 10.0.26100.32860