Quick answers
- Is CVE-2026-103555 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103555 being exploited in the wild.
- How severe is CVE-2026-103555?
- High severity, with a CVSS score of 7, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Virtual Hard Disk Miniport Driver.
- Is there a fix for CVE-2026-103555?
- 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-2026-103555 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-103555?
- Check whether you run Microsoft Virtual Hard Disk Miniport Driver. 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 the VHD Miniport Driver that can be triggered by an authorized local attacker. Exploitation requires prior access to the system; the attacker can craft input to overflow heap memory and achieve privilege escalation from user to system level. No exploitation in the wild has been reported as of the advisory date.
Affected products
- Microsoft Virtual Hard Disk Miniport Driver
Timeline
- 2026-10-13: disclosed