EUVD-2026-43910
GHSA-pfrf-837w-gw49
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local access with mandatory user interaction to open/mount crafted NTFS content (AV:L/UI:R), no prior privileges (PR:N), and code execution yields high C/I/A.
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
Out-of-bounds read in Windows NTFS allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in the Microsoft Windows NTFS driver stems from an out-of-bounds read (CWE-125) that an attacker can leverage to run arbitrary code on affected systems, spanning Windows 10 (1607 through 22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2012 through 2025. Exploitation requires local access and user interaction (AV:L/UI:R), typically opening or mounting a maliciously crafted file or volume, but no prior authentication (PR:N). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to get a victim to locally access attacker-controlled NTFS content - the CVSS vector's UI:R and AV:L mean a user must open, browse, or mount a crafted file or volume (such as a malicious VHD/VHDX disk image, ISO, or removable drive) so that the vulnerable ntfs.sys parsing path is reached. … 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. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious file or disk image (e.g., a VHD/VHDX or removable volume with corrupted NTFS metadata) and delivers it to a victim via email, download, or physical media. When the user opens or mounts the content, the NTFS driver parses the malformed structures, triggers the out-of-bounds read, and the attacker leverages the memory-safety defect to execute code in a privileged context. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50388 for your specific Windows SKU as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50388 (consult the Security Update Guide for the exact KB and patched build number for each affected version, as they differ across Windows 10, Windows 11, and Server 2012-2025). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Windows 10, 11, and Windows Server 2012-2025 systems using your vulnerability management tool; confirm patch availability in your deployment infrastructure. …
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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