# CVE-2026-42972: Microsoft Windows Hyper-V information disclosure

Source: https://junglewise.ai/threats/cve-2026-42972-microsoft-windows-hyper-v-information-disclosure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-42972 · Severity: medium · CVSS 5.5 · Published 2026-06-09

A security vulnerability in Microsoft Hyper-V, the software used to run virtual machines on Windows, could allow an authorized user to access sensitive information they should not be able to see. To exploit this, an attacker must already have local access to the system. While this does not allow for remote control of the computer, it could lead to the exposure of confidential data or system secrets.

Technologies: [Microsoft Hyper-V](https://junglewise.ai/threats/technologies/hyper-v). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-42972 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42972 being exploited in the wild.

**How severe is CVE-2026-42972?** Medium severity, with a CVSS score of 5.5, published 9 June 2026.

**Which products and versions are affected?** Microsoft Hyper-V Windows Server and Windows Desktop versions supporting Hyper-V.

**Is there a fix for CVE-2026-42972?** 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-2026-42972 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-42972?** Check whether you run Microsoft Hyper-V at an affected version. 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

Microsoft Hyper-V is vulnerable to an information disclosure flaw (CWE-200) when it fails to properly handle sensitive data in memory or storage. An attacker with local access and low-level privileges (PR:L) can exploit this vulnerability to read unauthorized information. The attack vector is local, meaning the attacker must have the ability to execute code on the host or a guest partition. Successful exploitation results in high confidentiality impact but does not directly affect system integrity or availability. Microsoft has released security updates to address this issue via the MSRC update guide.

## Affected products

- Microsoft Hyper-V Windows Server and Windows Desktop versions supporting Hyper-V

## Timeline

- 2026-06-09: disclosed
- 2026-06-09: advisory: Microsoft published the security advisory and update guide.

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42972](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42972)

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