Quick answers
- Is CVE-2026-113856 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-113856 being exploited in the wild.
- How severe is CVE-2026-113856?
- High severity, with a CVSS score of 7.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Windows Hyper-V.
- Is there a fix for CVE-2026-113856?
- 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-2026-113856 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-113856?
- Check whether you run Microsoft Windows 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
A heap-based buffer overflow exists in Windows Hyper-V that can be triggered by an authenticated local attacker to corrupt heap memory and achieve privilege elevation. The vulnerability requires the attacker to already have local access to the system. Successful exploitation grants the attacker system-level privileges on the Hyper-V host.
Affected products
- Microsoft Windows Hyper-V
Timeline
- 2026-11-10: disclosed