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