CVE-2026-62793 in Windows
Summary
by MITRE • 08/11/2026
Buffer over-read in Windows NTFS allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical buffer over-read condition within the Windows NTFS file system implementation that enables authenticated attackers to potentially access sensitive information on compromised systems. The flaw occurs when the operating system processes certain file operations within the NTFS file system, specifically during metadata handling or file attribute processing where insufficient bounds checking allows memory access beyond allocated buffer boundaries. Such vulnerabilities fall under the common weakness enumeration CWE-125 which describes out-of-bounds read conditions that can result in information disclosure or system instability. The security implications are particularly concerning as they occur within the core file system layer of windows operating systems, providing attackers with potential pathways to extract confidential data from memory regions that should remain protected.
The operational impact of this vulnerability extends beyond simple information disclosure as it creates opportunities for attackers to gather sensitive system information including file contents, user credentials, or other confidential data stored in memory. When an authenticated user executes malicious operations against NTFS file system structures, the buffer over-read can result in unintended memory exposure that may reveal system internals, cryptographic keys, or other valuable intelligence. This type of vulnerability aligns with attack techniques described in the attack pattern taxonomy under techniques related to information gathering and privilege escalation through local system exploitation. The attacker typically requires valid user credentials to exploit this condition, making it a local privilege escalation vector rather than a remote attack surface.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and bounds checking within the file system components, along with maintaining current operating system patches from microsoft security updates. System administrators should prioritize applying relevant security patches immediately upon release and consider implementing additional monitoring for unusual file system access patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of robust memory safety practices in critical system components and reinforces the need for comprehensive code reviews focusing on buffer management within kernel-mode drivers. Organizations should also implement network segmentation and access controls to limit potential attack surface while maintaining continuous monitoring for suspicious local activity that could indicate exploitation of such local privilege escalation vulnerabilities.