EUVD-2026-44063
GHSA-495j-r955-q8f3
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively interact with attacker-supplied NTFS file-system data (UI:R) - the attacker must get the user to mount, open, or otherwise process a crafted NTFS volume, disk image, or file on the local machine (AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) describes a locally-triggered but high-impact flaw: no privileges are required (PR:N) but user interaction is (UI:R), which typically means the victim must mount, open, or otherwise process a malicious NTFS volume/file. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious NTFS-formatted volume - for example a USB drive, VHD/VHDX, or disk image with corrupted file-system metadata - and delivers it to a victim. When the user mounts or browses the volume, the malformed structures trigger the heap overflow in the kernel NTFS parser, allowing the attacker to run code in the victim's context. … |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
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. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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