CVE-2026-50313 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 inadequate input validation and memory management practices within the ntfs.sys kernel driver responsible for handling NTFS file system operations. When processing malformed or specially crafted file system requests, the driver fails to properly bounds-check heap-allocated buffers, allowing attackers to overwrite adjacent memory regions with malicious data. This memory corruption can be exploited to hijack execution flow and inject arbitrary code with kernel-level privileges, effectively bypassing standard user-mode security controls.
The technical exploitation of this vulnerability aligns with common software security patterns identified in the CWE database under category 121, which describes heap-based buffer overflow conditions where insufficient boundary checking allows data to be written beyond allocated buffer boundaries. The flaw occurs at the kernel level within the NTFS file system driver, making it particularly dangerous as it operates with the highest privilege level in the Windows operating system. Attackers typically leverage this vulnerability by crafting malicious files or directory structures that trigger the vulnerable code path during normal file system operations such as file creation, modification, or access requests.
The operational impact of this vulnerability extends beyond simple local code execution to encompass complete system compromise and potential lateral movement within network environments. Once successfully exploited, attackers gain unrestricted access to all system resources including sensitive data, user credentials, and system configuration information. The vulnerability affects multiple Windows versions including windows 10, windows server 2016, and later releases where the ntfs.sys driver remains active in the kernel space. This presents significant risk for enterprise environments where local access might be gained through various attack vectors such as phishing, physical access, or compromised user accounts with limited privileges.
Security practitioners should implement multiple layers of mitigation strategies to protect against this vulnerability while awaiting official patches from microsoft. The primary recommendation involves applying security updates immediately upon release, as microsoft has classified this issue with high severity and assigned it a specific CVE identifier. Network segmentation and privilege separation can help limit potential damage if exploitation occurs, though these measures do not prevent the initial attack vector. System administrators should also monitor for unusual file system activity patterns that might indicate exploitation attempts, particularly around ntfs driver operations. The ATT&CK framework categorizes this vulnerability under the privilege escalation technique T1068, where adversaries leverage software flaws to gain elevated privileges and execute malicious code with kernel-level permissions. Additionally, implementing exploit protection mechanisms such as control flow integrity checks and address space layout randomization can provide additional defense in depth against exploitation attempts.