# CVE-2026-45607: Microsoft Hyper-V out-of-bounds read code execution

Source: https://junglewise.ai/threats/cve-2026-45607-microsoft-hyper-v-out-of-bounds-read-code-execution  
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-2026-45607 · Severity: high · CVSS 8.4 · Published 2026-06-09

A security vulnerability has been identified in Microsoft Hyper-V, the software used to create and manage virtual machines on Windows systems. An attacker with local access to a system could exploit this flaw to run unauthorized commands or software. This could lead to a complete takeover of the affected system, potentially compromising sensitive data and disrupting business operations.

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

## Quick answers

**Is CVE-2026-45607 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-45607 being exploited in the wild.

**How severe is CVE-2026-45607?** High severity, with a CVSS score of 8.4, published 9 June 2026.

**Which products and versions are affected?** Microsoft Hyper-V.

**Is there a fix for CVE-2026-45607?** 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-2026-45607 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-45607?** Check whether you run Microsoft Hyper-V. 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

This vulnerability is classified as an out-of-bounds read (CWE-125) within the Microsoft Hyper-V hypervisor. The flaw occurs when the system reads data past the end of the intended buffer, which can be leveraged by a local attacker to achieve arbitrary code execution. The attack vector is local, meaning the attacker must already have a foothold on the system, but it requires no elevated privileges or user interaction. Successful exploitation results in a total loss of confidentiality, integrity, and availability (CVSS 8.4). Users are advised to refer to the Microsoft Security Response Center (MSRC) for official patches and mitigation guidance.

## Affected products

- Microsoft Hyper-V

## Timeline

- 2026-06-09: disclosed
- 2026-06-09: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45607](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45607)

## Related threats

- [Windows Hyper-V use after free privilege escalation](https://junglewise.ai/threats/cve-2026-119947-use-after-free-in-windows-hyper-v-allows-an-authorized-attacker)
- [Microsoft Windows Hyper-V heap overflow privilege escalation](https://junglewise.ai/threats/cve-2026-50680-microsoft-windows-hyper-v-heap-overflow-privilege-escalation)
- [Microsoft Hyper-V buffer over-read denial of service](https://junglewise.ai/threats/cve-2026-50485-microsoft-hyper-v-buffer-over-read-denial-of-service)
- [Microsoft Hyper-V out-of-bounds read code execution](https://junglewise.ai/threats/cve-2026-47652-microsoft-hyper-v-out-of-bounds-read-code-execution)
- [Microsoft Hyper-V code execution via type confusion](https://junglewise.ai/threats/cve-2026-45641-microsoft-hyper-v-code-execution-via-type-confusion)