---
title: "CVE-2026-69603: Windows Hyper-V - Buffer Overflow"
description: "Windows Hyper-V contains a heap-based buffer overflow caused by improper memory handling, letting authorized attackers execute code locally, exploit requires local access with authorization."
url: https://panop.io/threat-heartbeat/CVE-2026-69603/
---

# CVE-2026-69603 Windows Hyper-V - Buffer Overflow

Windows Hyper-V contains a heap-based buffer overflow caused by improper memory handling, letting authorized attackers execute code locally, exploit requires local access with authorization.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.33% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-69603)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Published

8 September 2026

Updated

15 October 2026

Weakness

[CWE-122](https://cwe.mitre.org/data/definitions/122.html)

## Vendor fix

Update to the latest version of Windows Hyper-V.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-69603](https://nvd.nist.gov/vuln/detail/CVE-2026-69603)
- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69603](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69603)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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