Out-of-bounds read in Microsoft .NET Framework - CVE-2026-121677
Published: November 11, 2026
Vulnerability identifier: #VU165441
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-121677
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose small portions of heap memory.
The vulnerability exists due to an out-of-bounds read in Remote Desktop Client when handling network communications. A remote attacker can trigger an out-of-bounds read over the network, with user interaction required, to disclose small portions of heap memory.
Affected software
Microsoft .NET Framework
How to mitigate CVE-2026-121677
Install security update from vendor's website.
Microsoft .NET Framework - update to 2.0.1489.0