EUVD-2026-43869
GHSA-v7wh-hfv4-55rx
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file/volume parsing flaw needing victim interaction (AV:L, UI:R) but no prior privileges (PR:N); kernel-context overflow yields full C/I/A compromise.
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 driver (heap-based buffer overflow, CWE-122) allows an attacker to run arbitrary code with the privileges of the exploited context. The flaw affects a broad range of Windows client and server 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 a maliciously crafted NTFS artifact - a file or a specially formed NTFS volume/disk image - that is then parsed by the Windows NTFS driver, and it requires user interaction (CVSS UI:R): the victim must open the file or trigger the mount/access of the crafted volume. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, base 7.8, High) indicates a local attack vector with low complexity, no prior privileges, but required user interaction - consistent with a scenario where a victim must open or mount a maliciously crafted file or volume rather than a fully remote drive-by. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious file or a specially structured disk image/volume and delivers it to a victim via email, download, or removable media; when the user opens the file or the volume is mounted, the NTFS driver parses the malformed metadata and overflows a heap buffer in kernel memory, allowing the attacker to execute code in the exploited context. No public exploit is identified at time of analysis, and the CVSS UI:R requirement means the victim must be induced to interact with the crafted artifact. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50313 for your specific Windows build via Windows Update or WSUS/Intune, using the per-KB fixed versions listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50313 (no single global fix version was provided in the source data, so select the KB matching each affected SKU). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory affected Windows systems (Windows 10 1607-22H2, Windows 11 all versions through 26H1, Windows Server 2012-2025) and assess which are exposed to untrusted local users; communicate patch timeline to stakeholders. …
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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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