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
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 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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated local access with low privileges (PR:L) and the ability to execute code on the target host - this is a local elevation-of-privilege flaw, not remotely reachable (AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8) describes a local, low-complexity attack requiring only low privileges and no user interaction, yielding full confidentiality, integrity, and availability impact - a classic reliable local EoP profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user who already has local access (for example a standard user on a shared terminal/session-host server, or malware running in a limited context) crafts or attaches a malicious VHD image that triggers the heap overflow in the miniport driver. By grooming the kernel heap and overwriting adjacent pool structures, the attacker escalates from their limited account to SYSTEM. … |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 10, Windows 11, and Windows Server systems running VHD Miniport Driver and assess patch readiness. …
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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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