CVE-2026-88147: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607

This vulnerability, identified as CVE-2026-88147 and classified under CWE-122 (Heap-based Buffer Overflow), exists in the Windows Secure Socket Tunneling Protocol (SSTP) implementation. An authorized attacker with local access can exploit this flaw to gain elevated privileges, potentially compromising system integrity. The vulnerability affects multiple Windows 10 builds, specifically versions from 10.0.14393.0 up to but not including 10.0.14393.9612, and other specified version ranges. Microsoft has published an official security update to remediate this issue.

Successful exploitation of this heap-based buffer overflow vulnerability can lead to privilege escalation, granting an authorized local attacker higher system privileges. This can result in full system compromise, including the ability to execute arbitrary code with elevated rights, impacting confidentiality, integrity, and availability of the affected system.

Microsoft has released official security updates that address this vulnerability. Users and administrators should apply the provided patches for their specific Windows 10 versions as soon as possible to mitigate the risk. Since the vulnerability requires local authorization, ensuring systems are updated reduces the attack surface significantly.