CVE-2026-62797 in Windows
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical heap-based buffer overflow flaw within the Windows NTFS file system implementation that enables local privilege escalation for authenticated attackers. The technical root cause stems from improper bounds checking during heap memory allocation and manipulation processes within the ntfs.sys kernel driver responsible for NTFS file system operations. When legitimate user processes interact with NTFS filesystem structures, particularly during file creation, modification, or metadata handling operations, the system fails to validate input parameters against allocated heap buffers, creating opportunities for malicious data injection beyond intended memory boundaries.
The operational impact of this vulnerability extends beyond simple memory corruption as it provides a pathway for attackers who already possess valid user credentials to escalate their privileges from standard user level to SYSTEM level access. This privilege escalation occurs because the buffer overflow corrupts heap metadata structures that control memory allocation patterns, potentially allowing attackers to manipulate kernel memory layout or inject malicious code into kernel space where execution with highest privileges is possible. The vulnerability affects systems running Windows NTFS filesystems and requires local authentication since the attack vector operates within the context of legitimate user processes interacting with file system APIs.
From a cybersecurity perspective, this vulnerability aligns with CWE-122 heap-based buffer overflow classification and maps to multiple ATT&CK techniques including privilege escalation through kernel exploits and persistence mechanisms. The attack surface is particularly concerning because NTFS is the default filesystem for Windows operating systems, making this vulnerability potentially exploitable across vast enterprise environments where local authentication is possible. The exploitation typically requires crafting specific file operations that trigger the vulnerable code path within ntfs.sys driver, often involving manipulation of file attributes or metadata structures that are processed through heap allocation routines.
Mitigation strategies should prioritize immediate patch deployment from Microsoft security updates that address the specific heap overflow conditions in ntfs.sys driver implementation. System administrators should implement least privilege principles and restrict local user access to critical system resources where possible. Additional defensive measures include monitoring for unusual file system operations, implementing kernel-mode exploit detection systems, and maintaining comprehensive endpoint protection solutions that can identify anomalous memory allocation patterns. Organizations should also conduct vulnerability assessments focusing on file system drivers and ensure proper patch management processes are in place to address similar kernel-level vulnerabilities promptly. The remediation approach must consider both immediate emergency patches and long-term security architecture improvements to prevent similar heap corruption issues in other kernel components.