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Severity by source

Vendor (microsoft) PRIMARY
HIGH
qualitative
NVD
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
7.1 HIGH
cvss
vuln.today AI
7.8 HIGH

Local authenticated user (AV:L/PR:L) triggers a low-complexity heap overflow with no interaction, yielding SYSTEM control and total C/I/A impact within an unchanged scope.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Updated
Jul 22, 2026 - 15:58 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 22, 2026 - 15:52 vuln.today
cvss_changed
CVSS changed
Jul 22, 2026 - 15:52 NVD
8.2 (HIGH) 7.8 (HIGH)
Analysis Generated
Jul 14, 2026 - 19:42 vuln.today
CVE Published
Jul 14, 2026 - 17:08 nvd
HIGH 8.2

DescriptionNVD

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in the Windows Hyper-V component affects a broad range of supported Windows client and server releases (Windows 10 1809/21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2019/2022/2025). An authenticated low-privileged user can trigger a heap-based buffer overflow (CWE-122) to gain SYSTEM-level control on the host, with CVSS 3.1 rating 7.8. There is no public exploit identified at time of analysis, and the EPSS score is low (0.36%, 28th percentile).

Technical ContextAI

Hyper-V is Microsoft's native Type-1 hypervisor used for hardware virtualization on Windows client and server SKUs; because it mediates guest-to-host interactions and runs privileged virtualization services, memory-safety flaws in its components are a classic vector for local escalation and, in some cases, guest-to-host escape. The root cause here is CWE-122, a heap-based buffer overflow, meaning attacker-influenced data is written past the bounds of a heap-allocated buffer, corrupting adjacent heap metadata or objects to redirect execution or manipulate privileged state. The affected CPE set spans Windows 10 (1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2019, 2022, and 2025 (including Server Core installations), indicating the vulnerable Hyper-V code is shared across the modern Windows codebase.

RemediationAI

Apply the Microsoft security update for your specific build per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50680 - vendor-released patches are available and raise builds to at least 10.0.17763.9020 (1809/Server 2019), 10.0.19044.7548 (21H2), 10.0.19045.7548 (22H2), 10.0.26100.8875 (Windows 11 24H2), 10.0.26200.8875 (25H2), 10.0.28000.2269 (26H1), 10.0.20348.5386 (Server 2022), and 10.0.26100.33158 (Server 2025). Where immediate patching is not possible, the primary compensating control is to remove the attack surface on hosts that do not require virtualization by uninstalling or disabling the Hyper-V role/feature (side effect: virtual machines and any Hyper-V-dependent features such as WSL2, Windows Sandbox, or virtualization-based security integrations will stop working), and to tightly restrict interactive and low-privileged local logon on Hyper-V hosts since exploitation requires authenticated local access. Prioritize multi-tenant or shared virtualization hosts where untrusted low-privileged users can execute code.

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EUVD-2026-44137 vulnerability details – vuln.today

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