EUVD-2026-43931
GHSA-vpjv-4254-vv44
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local trigger via crafted volume/file (AV:L) needs a user to mount/open it (UI:R) but no attacker privileges (PR:N); a successful overflow yields full code execution, so 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 Microsoft Windows NTFS file-system driver lets an attacker run arbitrary code by triggering a heap-based buffer overflow (CWE-122) when Windows parses crafted file-system metadata. The flaw spans a broad range of supported releases, 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 of a crafted NTFS file-system structure (a malicious volume, disk image such as VHD/VHDX/ISO, or file) plus victim user interaction (UI:R) to mount or open it, at which point the NTFS driver parses the malformed metadata and triggers the heap overflow. … 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) describes a locally-triggered, low-complexity flaw needing no attacker privileges but gated by user interaction - consistent with a malicious-volume or malicious-file open rather than remote exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious NTFS volume or disk image (e.g., a VHD/VHDX or USB drive) containing malformed metadata that overflows a heap buffer in ntfs.sys, then delivers it and induces a victim to mount or open it (satisfying UI:R). When Windows parses the crafted structures, the overflow triggers and enables arbitrary code execution. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50448 for each affected edition as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50448 (consult that page for the exact fixed build per Windows/Server version, since precise fixed version numbers were not included in the input data). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, use your asset management and endpoint detection tools to identify all Windows systems running versions 10 (1607 and later), 11 (through 26H1), Server 2012, Server 2016, Server 2019, Server 2022, and Server 2025. …
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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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