Out-of-bounds read in Windows and Windows Server - CVE-2026-35423
Published: May 12, 2026
Vulnerability identifier: #VU131254
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-35423
CWE-ID: CWE-125
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 gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in Windows 11 Telnet Client. A remote attacker can trick a victim to initiate a Telnet connection to a malicious or compromised server, trigger an out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) condition.
How to mitigate CVE-2026-35423
Install updates from vendor's website.