EUVD-2026-73690
GHSA-7449-g8fw-v46f
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable unauthenticated RCE with full host impact, but AC:H reflects that Hyper-V host overflows typically need specific state/guest positioning not proven by the terse description.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Windows Hyper-V arises from a stack-based buffer overflow that lets an unauthorized attacker run arbitrary code across a network, per Microsoft's CVSS 3.1 vector (AV:N/PR:N/UI:N) scoring 9.8. The flaw affects the Hyper-V virtualization component across a broad range of client and server Windows builds, from Windows 10 1607 and Server 2016 through Windows 11 26H1 and Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Per Microsoft's CVSS vector (AV:N/AC:L/PR:N/UI:N), no authentication or user interaction is required and the attack is over the network against a system running the Hyper-V role. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a genuine high priority: Microsoft's own CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H = 9.8) describes network-reachable, unauthenticated code execution with full CIA impact, and the vulnerability was reported by Microsoft's MSRC (secure@microsoft.com) with a patch already available. … 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 Microsoft security update for CVE-2026-69910 via the MSRC update guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69910); Patch available per vendor advisory, with fixed builds per SKU including 10.0.14393.9512 (Server 2016 / Win10 1607), 10.0.17763.9245 (Server 2019 / Win10 1809), 10.0.19044.7725 / 10.0.19045.7725 (Win10 21H2/22H2), 10.0.20348.5622 (Server 2022), 10.0.22631.7582 (Win11 23H2), 10.0.26100.9445 / 10.0.26200.9445 (Win11 24H2/25H2), 10.0.28000.2954 (Win11 26H1), and 10.0.26100.33438 (Server 2025). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server systems with Hyper-V role enabled to identify scope and prioritize production infrastructure. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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