CVE-2026-97813: Windows Hyper-V heap buffer overflow information disclosure

CVE-2026-97813 · Severity: medium · CVSS 6.5 · Published 2026-10-13

Windows Hyper-V, Microsoft's virtualization platform used to run virtual machines in data centers and enterprises, contains a heap buffer overflow vulnerability. An authorized attacker can exploit this flaw to read sensitive information from the system over the network, potentially exposing data from the host or virtual machines.

Technologies: Microsoft Windows Hyper-V, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows 11 26h2, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025. Vendors: Microsoft.

Quick answers

Is CVE-2026-97813 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-97813 being exploited in the wild.
How severe is CVE-2026-97813?
Medium severity, with a CVSS score of 6.5, published 13 October 2026.
Which products and versions are affected?
Microsoft Windows Hyper-V.
Is there a fix for CVE-2026-97813?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-97813 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-97813?
Check whether you run Microsoft Windows Hyper-V, Microsoft Windows 10 1809, Microsoft Windows 10 21h2 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to trigger the vulnerability remotely over the network, resulting in information disclosure. The vulnerability requires an attacker to have valid credentials or authorized access. The flaw permits reading adjacent heap memory, potentially exposing sensitive data from running processes or guest virtual machines.

Affected products

  • Microsoft Windows Hyper-V

Timeline

  • 2026-10-13: disclosed

References

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