EUVD-2026-43862
GHSA-9xqj-ppwh-278r
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local, low-complexity parsing bug needing no privileges but requiring the victim to open/mount crafted content (UI:R), yielding full kernel-level code execution (C/I/A:H).
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 the Windows NTFS file system driver lets an unauthorized attacker run arbitrary code by tricking a user into interacting with specially crafted content, per Microsoft's MSRC advisory. The flaw is a heap-based buffer overflow (CWE-122) affecting a broad range of Windows releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local delivery of specially crafted NTFS content and a user action to process it: per the CVSS vector (AV:L, UI:R), the victim must open, access, or mount an attacker-supplied file or disk image (such as a crafted VHD/VHDX, ISO, or NTFS volume) so the NTFS driver parses the malformed structures. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - local attack vector, low complexity, no privileges required but user interaction required, with high confidentiality, integrity and availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails or hosts a crafted NTFS disk image (for example a malicious VHDX or ISO) and lures a user into double-clicking or mounting it; when the NTFS driver parses the malformed metadata, the heap overflow corrupts kernel memory and executes attacker code. Given AV:L/AC:L, the technical bar is low once the file is opened, but success hinges entirely on that user interaction. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50386 via Windows Update or WSUS/SCCM to all affected client and server SKUs, prioritizing the correct KB for each Windows build listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50386 (an exact fixed version is not enumerated in the provided data, so verify the KB per OS build). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all systems running Windows 10, Windows 11, and Windows Server 2012-2025 to establish your organization's patch scope. …
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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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