What is the CVSS score of EUVD-2026-43931?

EUVD-2026-43931 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Which versions of Windows NTFS are affected by EUVD-2026-43931?

A high-severity vulnerability in Windows' core file-system component (NTFS driver) could allow attackers with local system access to execute code and escalate privileges, potentially enabling lateral…. A patch is available.

How to fix or mitigate EUVD-2026-43931?

Within 24 hours, use your asset management and endpoint detection tools to identify all Windows systems running versions 10 (1607 and later), 11 (through 26H1), Server 2012, Server 2016, Server 2019, Server 2022, and Server 2025. Within 7 days, prioritize patching for critical assets: domain controllers, identity and access servers, and sensitive file servers using the Microsoft patch released in the current security update cycle; coordinate with change control to schedule deployment windows. Within 30 days, complete patching of all remaining affected endpoints, including end-user workstations, and verify success through your patch management dashboard.

Windows NTFS EUVD-2026-43931

| CVE-2026-50448 HIGH

Heap-based Buffer Overflow (CWE-122)

2026-07-14 microsoft

GHSA-vpjv-4254-vv44

Buffer Overflow Heap Overflow Microsoft Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025 Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows Server 2016 Server Core Installation Windows Server 2019 Server Core Installation Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H1 Windows Server 2025 Server Core Installation Windows Server 2012 Server Core Installation Windows Server 2012 R2 Windows Server 2012 R2 Server Core Installation

7.8

CVSS 3.1 · Vendor: microsoft

Severity by source

Vendor (microsoft) PRIMARY

7.8 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

vuln.today AI

7.8 HIGH

Local trigger via crafted volume/file (AV:L) needs a user to mount/open it (UI:R) but no attacker privileges (PR:N); a successful overflow yields full code execution, so C/I/A:H.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jul 14, 2026 - 20:24 vuln.today

CVE Published

Jul 14, 2026 - 17:07 cve.org

HIGH 7.8

DescriptionCVE.org

Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally.

AnalysisAI

Local code execution in the Microsoft Windows NTFS file-system driver lets an attacker run arbitrary code by triggering a heap-based buffer overflow (CWE-122) when Windows parses crafted file-system metadata. The flaw spans a broad range of supported releases, from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. It carries a CVSS 7.8 (Important) rating, requires user interaction, has a vendor patch available, and no public exploit identified at time of analysis.

Technical ContextAI

NTFS is the default Windows file-system driver (ntfs.sys) shipping in every modern client and server edition; it parses on-disk metadata such as the Master File Table, index attributes, and reparse points in privileged context. CWE-122 (heap-based buffer overflow) indicates a length or bounds check on attacker-controlled file-system metadata is mishandled, allowing a write past an allocated heap buffer when a crafted volume or file is processed. Because NTFS parsing runs when a volume is mounted or a file is accessed, the corruption occurs during normal handling of malformed structures. The CPE set (cpe:2.3:a:microsoft:windows_10_version_1607 through windows_11_version_26h1, plus windows_server_2012/2012_r2 and their Server Core installations) and the tag list extend coverage to Server 2016, 2019, 2022 and 2025, indicating long-standing shared code across the Windows codebase.

RemediationAI

Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50448 for each affected edition as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50448 (consult that page for the exact fixed build per Windows/Server version, since precise fixed version numbers were not included in the input data). Prioritize systems where users routinely mount external or untrusted volumes. Where immediate patching is not possible, reduce exposure by restricting the mounting of untrusted media and disk images - for example, disable or restrict auto-mounting of USB storage and block mounting of VHD/VHDX and ISO images via Group Policy and device control; the trade-off is reduced convenience for legitimate removable-media and virtual-disk workflows. User awareness (do not open or mount file-system images from untrusted sources) further limits the UI:R trigger. These are compensating controls only; the update is the definitive fix.