Quick answers
- Is CVE-2026-45641 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-45641 being exploited in the wild.
- How severe is CVE-2026-45641?
- 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-2026-45641?
- 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-2026-45641 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-45641?
- 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 characterized as a type confusion (CWE-843) and out-of-bounds read within the Microsoft Hyper-V hypervisor. The flaw allows an unauthorized local attacker to bypass memory safety protections. By exploiting this issue, an attacker can achieve arbitrary code execution in the context of the host operating system. The attack vector is local, meaning the attacker must already have a presence on the system, but it requires no elevated privileges or user interaction to execute. Microsoft has released information regarding this vulnerability via their Security Update Guide.
Affected products
- Microsoft Hyper-V
Timeline
- 2026-06-09: disclosed
- 2026-06-09: advisory