SB20260512115 - Out-of-bounds read in Microsoft Windows 11 Telnet Client
Published: May 12, 2026
Security Bulletin ID
SB20260512115
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-35423)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 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
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.
Remediation
Install update from vendor's website.