CVE-2026-50471 in Windows
Summary
by MITRE • 07/14/2026
Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical heap-based buffer overflow flaw within the Windows NTFS file system implementation that enables local privilege escalation through arbitrary code execution. The vulnerability stems from improper input validation and memory management practices during NTFS file operations, particularly when handling malformed or oversized data structures in file metadata. Attackers can exploit this weakness by crafting specially crafted files or directory structures that trigger memory corruption during normal file system operations, leading to potential code execution with elevated privileges. The flaw exists at the kernel level within the NTFS file system driver, making it particularly dangerous as it operates outside of user-mode restrictions and can bypass standard security boundaries.
The technical implementation of this vulnerability involves heap memory corruption that occurs when the NTFS driver processes file attributes or directory entries exceeding predefined buffer limits. This type of vulnerability falls under CWE-121 Heap-based Buffer Overflow, which specifically addresses buffer overflows occurring in heap-allocated memory regions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The exploitation mechanism typically involves manipulating file system structures such as Master File Table entries, file record headers, or attribute lists that are parsed without adequate validation of input lengths. When the system attempts to process these malformed structures, the heap corruption can be leveraged to redirect execution flow through controlled memory overwrite techniques.
The operational impact of this vulnerability extends beyond simple code execution capabilities as it enables attackers to escalate privileges from standard user accounts to SYSTEM level access within the Windows operating environment. This local privilege escalation allows adversaries to bypass typical security controls including User Access Control, file permissions, and application sandboxing mechanisms that normally protect system integrity. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1068 Privilege Escalation through exploitation of kernel-level vulnerabilities, representing a sophisticated attack vector requiring minimal user interaction beyond initial system access. The vulnerability's local nature means that attackers must first gain access to the target system through other means such as phishing, credential theft, or network-based attacks before exploiting this specific weakness.
Mitigation strategies for this vulnerability encompass both immediate patch management and long-term architectural improvements to reduce attack surface and memory corruption risks. Microsoft typically addresses such issues through targeted security updates that include enhanced input validation, improved memory boundary checking, and additional heap management safeguards within the NTFS driver components. System administrators should prioritize applying relevant security patches immediately upon release and implement additional defensive measures including regular system monitoring for anomalous file system behavior, enhanced logging of file operations, and network segmentation to limit potential lateral movement. The vulnerability also highlights the importance of memory safety practices in kernel-mode drivers and reinforces the need for comprehensive code review processes that specifically address heap management and buffer handling scenarios as outlined in industry security frameworks such as the CERT Secure Coding Standards and Microsoft's Security Development Lifecycle practices.