EUVD-2026-43864
GHSA-3jhf-6mfp-j33g
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged user triggers a kernel NTFS heap overflow with no user interaction, gaining full SYSTEM code execution, hence AV:L/PR:L and C/I/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Windows NTFS arises from a heap-based buffer overflow (CWE-122) that an authorized, low-privileged local user can trigger to run arbitrary code and elevate to SYSTEM. The flaw spans a broad Windows footprint 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 the attacker to already hold authenticated low-privileged local access to the target host (CVSS PR:L, AV:L) and the ability to execute code or issue file-system operations against an NTFS volume - the near-universal default file system on Windows. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, score 7.8) describes a locally exploitable flaw of low attack complexity requiring low privileges and no user interaction, yielding full confidentiality, integrity, and availability impact within an unchanged scope - a classic local elevation-of-privilege profile rather than a remote-entry vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained low-privileged local access - via phishing, a compromised service account, or a foothold from another bug - runs a program that issues crafted file-system operations against an NTFS volume to overflow a heap buffer in the kernel NTFS driver. The resulting pool corruption is groomed into arbitrary kernel-mode code execution, elevating the attacker to SYSTEM. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50309 as documented in the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50309, selecting the KB that matches each affected build (Windows 10 1607-22H2, Windows 11 24H2-26H1, and Windows Server 2012 through 2025 including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of all affected systems including Windows 10 (versions 1607 through current), Windows 11 (all versions through 26H1), and Windows Server 2012 through 2025 across your environment. …
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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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