What is the CVSS score of EUVD-2026-44063?

EUVD-2026-44063 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-2026-44063?

CVE-2026-50461 affects Windows NTFS driver across Windows Server 2012 R2 through Windows 11 and Server 2025, potentially allowing attackers to steal data or disrupt services when users open specially…. A patch is available.

How to fix or mitigate EUVD-2026-44063?

Within 24 hours, identify and inventory all Windows systems running affected versions (Windows Server 2012/2012 R2 through Windows Server 2025 and Windows 11 through 26H1), and assess exposure risk based on user file handling practices. Within 7 days, obtain and deploy Microsoft's released security patch for CVE-2026-50461 to all production servers and critical business systems. Within 30 days, complete patch deployment across all remaining organizational Windows systems to achieve enterprise-wide remediation.

Windows NTFS EUVD-2026-44063

| CVE-2026-50461 HIGH

Heap-based Buffer Overflow (CWE-122)

2026-07-14 microsoft

GHSA-495j-r955-q8f3

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

Temporal: 6.8

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

CIRCL (temporal)

6.8 MEDIUM

cvss

vuln.today AI

7.8 HIGH

Local trigger via crafted NTFS data with no privileges (PR:N) but required user interaction (UI:R); kernel code execution yields full C/I/A impact.

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:A/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 - 20:15 vuln.today

CVE Published

Jul 14, 2026 - 17:07 nvd

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 Microsoft Windows NTFS (New Technology File System) driver arises from a heap-based buffer overflow (CWE-122) that an attacker can trigger by inducing a user to interact with a specially crafted NTFS volume or file. Affecting a broad range of Windows client and server builds from Windows Server 2012/2012 R2 through Windows 11 26H1 and Windows Server 2025, successful exploitation yields high confidentiality, integrity, and availability impact. There is no public exploit identified at time of analysis and the issue is not listed in CISA KEV; Microsoft has issued a fix.

Technical ContextAI

NTFS is the default, kernel-mode file system driver used across virtually all modern Windows installations to manage on-disk metadata such as the Master File Table, index structures, and attribute records. CWE-122 (heap-based buffer overflow) indicates that parsing of attacker-influenced file-system structures writes past the bounds of a heap allocation - a classic memory-safety defect in a privileged parser. Because NTFS parsing runs in kernel context, corrupting adjacent heap memory can be leveraged to hijack control flow or overwrite kernel objects. The affected CPE set spans Windows 10 (1607/1809/21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2012 through 2025, confirming the flaw is in a shared core component rather than an edition-specific feature.

RemediationAI

Apply the Microsoft security update for CVE-2026-50461 (patch available per vendor advisory) via Windows Update or WSUS/SCCM as soon as possible for every affected build; consult the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50461 to select the correct cumulative update KB for each OS version, including Server Core systems. No exact standalone fix version string was provided in the input, so identify the specific KB per build from the advisory. Because exploitation depends on a user interacting with a crafted NTFS volume, effective compensating controls until patching include blocking or restricting the mounting of untrusted removable media and disk images (VHD/VHDX/ISO) through Group Policy device-installation restrictions, and instructing users not to open or mount file systems from untrusted sources; the trade-off is reduced usability for legitimate removable-media and virtual-disk workflows.