EUVD-2026-43768
GHSA-hq98-j769-8vxv
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an existing low-privileged account (AV:L/PR:L), no user interaction, low complexity, yielding SYSTEM-level control with full C/I/A impact in an unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Virtual Hard Disk (VHD) Miniport Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Virtual Hard Disk (VHD) Miniport Driver lets an authenticated low-privileged user corrupt kernel heap memory and gain SYSTEM-level control. The flaw (CWE-122 heap-based buffer overflow, CVSS 7.8) affects a broad range of Windows 10, Windows 11, and Windows Server builds and was reported by Microsoft. There is no public exploit identified at time of analysis and it is not listed in CISA KEV.
Technical ContextAI
The vulnerability resides in the VHD Miniport Driver, the kernel-mode storage component that presents Virtual Hard Disk (.vhd/.vhdx) images as attached disk devices in Windows. Because it runs in the kernel and parses attacker-influenced disk metadata and structures, a CWE-122 heap-based buffer overflow - writing past the bounds of a heap-allocated pool buffer - corrupts kernel memory. Successful heap grooming can overwrite adjacent kernel objects to hijack execution or escalate token privileges. The CPE data confirms the affected surface is the Windows OS itself across client (Windows 10 1607/1809/21H2/22H2, Windows 11 23H2/24H2/25H2/26H1) and server (Server 2016/2019/2022/2025, including Server Core) editions rather than a standalone application.
RemediationAI
Apply the Microsoft security update for CVE-2026-58601 for your specific Windows SKU and build; a patch is available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58601 - deploy the corresponding cumulative update through Windows Update, WSUS, or your patch-management tooling. Because exploitation requires local low-privileged access, effective compensating controls until patching completes include restricting the ability of untrusted or low-privileged users to run arbitrary code on affected hosts and limiting who can mount or attach VHD/VHDX images (for example via Group Policy, and by not exposing disk-image mounting to standard users), with the trade-off that this can disrupt legitimate workflows that rely on user-mounted virtual disks. Prioritize multi-user, RDP/session-host, and server systems where low-privileged local accounts are common.
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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
Leaving vuln.today