EUVD-2026-43778
GHSA-p6p6-5fqr-x4hg
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires an existing low-privileged local account (AV:L, PR:L) with no user interaction; kernel-mode code execution yields total confidentiality, integrity, and availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
AnalysisAI
Local privilege escalation via a heap-based buffer overflow in the Windows NTFS driver allows an authenticated attacker with low privileges to execute arbitrary code and gain full SYSTEM-level control. It affects a broad range of Windows client and server releases, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. No public exploit identified at time of analysis, and SSVC records no observed exploitation; EPSS is low at 0.29% (21st percentile).
Technical ContextAI
The flaw resides in NTFS, the default file system driver in Windows, which runs in kernel mode and parses on-disk metadata structures. CWE-122 (heap-based buffer overflow) indicates that NTFS allocates a heap buffer and then writes past its bounds, likely while processing attacker-influenced file system data or structures. Because the corruption occurs in a kernel-mode component, successful exploitation can overwrite adjacent heap objects and ultimately hijack kernel control flow, yielding code execution at the highest privilege level. The CPE data confirms the affected component is Microsoft Windows across a wide matrix of client (Windows 10 1607/1809/21H2/22H2, Windows 11 23H2/24H2/25H2/26H1) and server (Server 2012/2012 R2/2016/2019/2022/2025, including Server Core) editions.
RemediationAI
Apply the Microsoft security update for your specific Windows build, as a vendor-released patch is available; the fixed builds are the versions listed in the advisory (for example 10.0.26100.8875 for Windows 11 24H2/25H2, 10.0.19045.7548 for Windows 10 22H2, 10.0.20348.5386 for Windows Server 2022, and 10.0.26100.33158 for Windows Server 2025), obtained through Windows Update or from the MSRC guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58640. Because this is a kernel/file-system driver flaw with no configurable feature to disable, there is no clean product-level workaround; until patching, reduce risk by limiting who can obtain interactive or local low-privilege access to affected hosts, enforcing least privilege and strong endpoint controls, and prioritizing multi-user and server systems where untrusted local accounts exist - recognizing these are compensating controls that reduce opportunity but do not remove the vulnerability.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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