EUVD-2026-44137
GHSA-697p-w43p-4jgf
Severity by source
AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Local memory-corruption EoP requiring existing high privilege (PR:H, AV:L, AC:L); scope change (S:C) reflects guest-to-host boundary breach with full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft's Windows Hyper-V hypervisor allows an already-authenticated, high-privileged attacker to corrupt heap memory (CWE-122) and elevate to higher privileges on the host. The scope-changed CVSS 3.1 vector (8.2) reflects that a successful exploit can breach the guest/host virtualization boundary, impacting confidentiality, integrity, and availability of the underlying host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the Hyper-V role to be installed and enabled on the target Windows host, and the attacker must already possess high privileges (PR:H) - realistically local administrator within a guest VM or an equivalent privileged foothold on the host - with local access (AV:L); no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a credible but not top-tier emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained administrative privileges inside a Hyper-V guest VM (for example, a malicious tenant or a foothold from an earlier compromise) issues crafted input across the virtualization boundary that overflows a heap buffer in the host-side Hyper-V component, corrupting memory to execute code or elevate privileges on the host and break out of the VM. Because the vector is local with low complexity but requires high existing privilege, this is a realistic post-exploitation escalation step rather than an initial-access vector. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50680 - patch available per vendor advisory; install the relevant monthly cumulative update for each affected SKU as listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50680 (the MSRC page provides the exact patched build per Windows 10/11 and Windows Server version, which should be cited when scheduling deployment). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Hyper-V deployments and identify which hosts run production workloads requiring immediate remediation. …
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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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