Heap-based Buffer Overflow in Windows NTFS

Executive Summary

CVE-2026-50386 is a heap-based buffer overflow vulnerability in Windows NTFS. This flaw allows an unauthorized attacker to execute arbitrary code on a vulnerable system locally. A heap-based buffer overflow occurs when a program writes more data to a buffer than it can hold, corrupting or overwriting adjacent memory, which can lead to code execution.

The vulnerability is classified with a CVSS v3.1 base score of 7.8, indicating a high severity. The vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H means the attack requires local access (AV:L), low attack complexity (AC:L), no privileges (PR:N), user interaction (UI:R), and has high impacts on confidentiality, integrity, and availability.

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Detection Guidance

The provided context does not include specific detection methods or commands for identifying the presence of CVE-2026-50386 on a network or system. Detection typically involves checking for vulnerable versions of Windows NTFS or using security tools that scan for known vulnerabilities.

For accurate detection, refer to Microsoft's official guidance or use their recommended tools, such as the Microsoft Safety Scanner or Windows Update to check for patches.

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Impact Analysis

If exploited, this vulnerability could have severe consequences for affected systems and users.

• An attacker could execute arbitrary code with the privileges of the logged-in user, potentially taking full control of the system.
• Sensitive data stored on the system could be accessed, modified, or deleted by the attacker.
• The attacker could install malware, create backdoors, or use the compromised system to launch further attacks within a network.
• System stability and availability could be disrupted, leading to crashes or denial of service.

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Compliance Impact

This vulnerability could impact compliance with several standards and regulations, depending on the context of the affected system.

• GDPR: If the system processes personal data of EU citizens, a successful exploit could lead to unauthorized access or disclosure of this data, violating GDPR requirements for data protection and breach notification.
• HIPAA: For systems handling protected health information (PHI), exploitation could result in unauthorized access to PHI, violating HIPAA's Privacy and Security Rules.
• Other standards like PCI DSS (for payment card data) or industry-specific regulations may also be impacted if the compromised system handles sensitive or regulated data.

Organizations must ensure timely patching and mitigation to avoid potential compliance violations and associated penalties.

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Mitigation Strategies

To mitigate CVE-2026-50386, apply the official security update provided by Microsoft as soon as possible. The update addresses the heap-based buffer overflow in Windows NTFS.

• Visit the Microsoft Update Guide for CVE-2026-50386 to download and install the patch.
• Ensure all systems running Windows NTFS are updated to the latest secure version.
• Restrict local access to systems to minimize the risk of exploitation by unauthorized attackers.
• Monitor Microsoft's security advisories for any additional guidance or updates.

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