EUVD-2026-73329
GHSA-jq2v-w8hf-pf3w
Severity by source
AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Local admin required to trigger kernel-mode heap overflow; AC:H for heap layout constraints; S:C reflects potential hypervisor/VM boundary escape.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Virtual Hard Disk (VHD) Miniport Driver allows an authorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow in the Windows Virtual Hard Disk (VHD) Miniport Driver enables a local attacker already holding administrator-level privileges to execute arbitrary code with scope change - meaning successful exploitation can affect components beyond the vulnerable driver itself, most critically the Hyper-V hypervisor or co-hosted VMs. The flaw spans virtually all supported Windows versions from Server 2012 through Windows 11 26H1 and Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess local administrator (high privilege) access on the target Windows system - this is the primary limiting factor and firmly places the flaw in post-compromise or insider-threat scenarios. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.5 (AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H) reflects a constrained attack surface: exploitation demands local access, administrator-level privileges, and high-complexity conditions (AC:H), placing this firmly in post-compromise or insider-threat territory rather than opportunistic remote exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the applicable Microsoft Cumulative Update for your Windows version to reach the patched build thresholds confirmed in EUVD-2026-73329. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems running Server 2012-Server 2025 or Windows 11 26H1, prioritizing Hyper-V hosts. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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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