Heap-based buffer overflow in Windows and Windows Server - CVE-2026-42904
Published: June 11, 2026
Vulnerability identifier: #VU134355
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-42904
CWE-ID: CWE-122
Exploitation vector: Adjecent network
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 on the target system.
The vulnerability exists due to a boundary error in Windows TCP/IP. A remote attacker on the local network can pass specially crafted data to the application, trigger a heap-based buffer overflow and gain elevated privileges on the target system.
How to mitigate CVE-2026-42904
Install updates from vendor's website.