Quick answers
- Is CVE-2026-85366 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-85366 being exploited in the wild.
- How severe is CVE-2026-85366?
- High severity, with a CVSS score of 7.8, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Windows Installer.
- Is there a fix for CVE-2026-85366?
- 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-2026-85366 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-85366?
- Check whether you run Microsoft Windows Installer. 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 in the Windows Installer service allows a local authenticated attacker to corrupt memory and execute arbitrary code with elevated privileges. The vulnerability requires prior local access to the system and a valid user account. This is a local privilege escalation vector that does not require network access.
Affected products
- Microsoft Windows Installer
Timeline
- 2026-10-13: disclosed