Heap-based buffer overflow in Windows and Windows Server - CVE-2026-56194
Published: July 17, 2026
Vulnerability identifier: #VU138123
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-56194
CWE-ID: CWE-122
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 user to escalate privileges.
The vulnerability exists due to heap-based buffer overflow in Windows Network File System when handling network file system requests. A remote user can send specially crafted network requests to escalate privileges.
Successful exploitation could allow the attacker to obtain SYSTEM privileges.
How to mitigate CVE-2026-56194
Install security update from vendor's website.