EUVD-2026-43940
GHSA-f76x-f2rf-3qc8
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local vector with required user interaction to open crafted NTFS content, no privileges needed, full CIA impact from in-context code execution matching a memory-corruption RCE.
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 (the New Technology File System driver) arises from a heap-based buffer overflow that lets an attacker run arbitrary code with the privileges of the affected process. The flaw affects a broad swath of supported Windows client and server builds, from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local delivery plus user interaction: per the CVSS vector (AV:L, UI:R) the attacker must induce the victim to open or mount attacker-controlled NTFS content - such as a malicious VHD/VHDX, ISO, or removable/mounted volume - so the vulnerable NTFS parser processes the malformed heap structures. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are internally consistent and point to a serious but not top-tier-urgent issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious NTFS structure - for example a booby-trapped VHD/VHDX or a removable volume with corrupted MFT metadata - and delivers it to a target via download, email, or physical media. When the victim opens or mounts the crafted volume, the NTFS driver mis-parses the malformed heap data, triggering the overflow and executing the attacker's code locally with the process's privileges. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50471 - Patch available per vendor advisory - via Windows Update or WSUS/Intune across all affected client and server SKUs, prioritizing internet-facing and multi-user systems; the advisory and downloadable packages are at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50471. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate all Windows 10, 11, and Server instances to determine patch scope and prioritize systems by sensitivity. …
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External POC / Exploit Code
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