EUVD-2026-73676
GHSA-9hf8-9jjh-q349
Severity by source
AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Local attack requiring guest-admin (PR:H); low complexity once inside VM; S:C and full C/I/A reflects VM escape to host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Windows Hyper-V allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in Windows Hyper-V allows a locally authenticated attacker with high privileges to escalate privileges and escape the guest VM boundary, achieving scope change to the underlying host. Affected across a broad range of Windows 10, 11, and Windows Server releases from 2016 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold administrator-level (high-privilege) access within a Hyper-V guest virtual machine running on an affected Windows build. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.2 score reflects a locally-triggered, high-privilege-required exploit with scope change to the host - a profile typical of VM escape primitives. … 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 vendor-released patches via Windows Update or WSUS, targeting the build thresholds listed in EUVD-2026-73676 for each affected Windows version (e.g., Windows Server 2025 should reach build 10.0.26100.33438 or later, Windows Server 2022 should reach 10.0.20348.5622 or later). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Windows Server 2016-2025 and Windows 10/11 systems running Hyper-V; identify systems with elevated local user accounts and assess exposure in your environment. …
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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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