CVE-2026-62768 in Windows
Summary
by MITRE • 08/11/2026
Stack-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/11/2026
A stack-based buffer overflow vulnerability exists within the Windows Installer component that enables an authenticated attacker to achieve local privilege escalation. This flaw resides in the installer's handling of malformed input data during the installation process, specifically when processing certain parameters or configuration values. The vulnerability stems from inadequate bounds checking mechanisms that fail to validate the size of incoming data before copying it onto the stack. When an attacker provides malicious input exceeding the allocated buffer space, the excess data overflows into adjacent memory locations, potentially corrupting critical program state information including return addresses and control flow data.
The technical implementation of this vulnerability aligns with common software security weaknesses categorized under CWE-121 stack-based buffer overflow conditions. Attackers can exploit this by crafting specially formatted installation packages or configuration files that trigger the vulnerable code path during execution. The flaw typically manifests when Windows Installer processes user-supplied parameters without proper validation, allowing attackers to overwrite stack memory in a controlled manner. This memory corruption can be leveraged to redirect program execution flow and execute arbitrary code with elevated privileges.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with persistent access to compromised systems. Once successfully exploited, the attacker gains the ability to perform actions that would normally require administrative rights including modifying system files, installing malicious software, or establishing backdoor access. The local nature of the attack means that physical or network access is required for exploitation, but once achieved, the compromised system becomes a potential foothold for further lateral movement within enterprise environments. This vulnerability particularly affects systems where users have the ability to execute installation packages or modify system configurations.
Mitigation strategies should focus on implementing comprehensive input validation controls and applying security patches provided by Microsoft through regular Windows updates. System administrators should enforce least privilege principles and limit user capabilities to reduce the attack surface available to potential exploiters. Additional defensive measures include monitoring for suspicious installation activities, implementing application whitelisting policies, and ensuring that only trusted installation packages are executed on critical systems. The vulnerability also highlights the importance of secure coding practices including proper buffer size validation, use of safe string handling functions, and regular code reviews to identify similar patterns that could lead to memory corruption vulnerabilities. Organizations should consider implementing network segmentation and access controls to limit potential lateral movement once a system has been compromised through this vector.