CVE-2026-62770 in Windows
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows Shell allows an authorized attacker to elevate privileges locally.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/11/2026
A heap-based buffer overflow vulnerability exists within the windows shell component that enables an authenticated attacker to achieve local privilege escalation. This flaw resides in the memory management handling of shell processes and occurs when the system processes user input through shell commands or scripts without adequate bounds checking. The vulnerability manifests when malicious input exceeds the allocated heap memory buffer, causing adjacent memory locations to be overwritten with attacker-controlled data. This type of vulnerability falls under the common weakness enumeration category CWE-121 heap-based buffer overflow which represents a critical class of memory safety issues that have been extensively documented in cybersecurity literature and represent one of the most prevalent attack vectors exploited by threat actors.
The technical exploitation of this vulnerability requires an attacker to already possess valid user credentials on the target system since the privilege escalation occurs locally. Once authenticated, the attacker can craft specific shell commands or script inputs that trigger the buffer overflow condition within the vulnerable heap memory allocation. The overflow allows the attacker to overwrite critical memory structures such as return addresses, function pointers, or other control data that governs program execution flow. This memory corruption enables the attacker to redirect program execution to malicious code locations and subsequently execute arbitrary code with elevated privileges. The attack follows established patterns described in the attack technique matrix under ATT&CK T1068 privilege escalation through local exploitation.
The operational impact of this vulnerability extends beyond simple code execution as it provides a pathway for attackers to gain system-level access from a standard user account. This represents a significant security risk since it allows adversaries to bypass traditional authentication mechanisms and move laterally within networks where users have legitimate access. The vulnerability affects systems running vulnerable versions of the windows operating system where shell components are present, potentially impacting desktop environments, server installations, and enterprise workstations that utilize shell interfaces for automation or administrative tasks.
Mitigation strategies should focus on implementing robust memory safety protections including stack canaries, address space layout randomization ASLR, and data execution prevention DEP mechanisms. Microsoft has released security patches that address this specific heap overflow vulnerability through proper bounds checking in shell command processing and enhanced memory management routines. Organizations should prioritize patch management to ensure all systems receive the latest security updates and consider implementing application whitelisting policies to restrict potentially malicious shell script executions. Additionally, regular security assessments and penetration testing should be conducted to identify similar memory corruption vulnerabilities that may exist within other system components and applications.
The vulnerability demonstrates the ongoing challenges in maintaining secure memory management practices in complex operating system environments where legacy code bases interact with modern exploitation techniques. It underscores the importance of defensive programming practices and continuous security monitoring to detect and remediate such critical flaws before they can be exploited by adversaries. Security teams must maintain awareness of known vulnerabilities and their potential impact on organizational infrastructure while implementing layered security controls that provide defense in depth against various attack vectors including local privilege escalation threats.