# CVE-2026-96085: Windows Installer heap-based buffer overflow allows privilege elevation

Source: https://junglewise.ai/threats/cve-2026-96085-heap-based-buffer-overflow-in-windows-installer-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-96085 · Severity: high · CVSS 7.8 · Published 2026-11-10

Windows Installer, a system component that installs and manages software packages on Windows systems, contains a heap buffer overflow vulnerability. An attacker with local system access and authorization to install software could exploit this flaw to gain elevated privileges and take control of the system.

Technologies: [Microsoft Windows Installer](https://junglewise.ai/threats/technologies/windows-installer). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-96085 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96085 being exploited in the wild.

**How severe is CVE-2026-96085?** High severity, with a CVSS score of 7.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft Windows Installer.

**Is there a fix for CVE-2026-96085?** 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-2026-96085 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-96085?** 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 exists in Windows Installer that can be triggered by an authorized local attacker, allowing arbitrary code execution with elevated privileges. The vulnerability requires local access and prior authorization, but once exploited grants privilege escalation. A fix from Microsoft is expected to address this issue.

## Affected products

- Microsoft Windows Installer

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96085](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96085)

## Related threats

- [Microsoft Windows Installer stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-96152-stack-based-buffer-overflow-in-windows-installer-allows-an)
- [Microsoft Windows Installer heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-96062-heap-based-buffer-overflow-in-windows-installer-allows-an)
- [Windows Installer use-after-free privilege elevation](https://junglewise.ai/threats/cve-2026-96061-use-after-free-in-windows-installer-allows-an-authorized-attacker)
- [Windows Installer out-of-bounds read privilege escalation](https://junglewise.ai/threats/cve-2026-96060-out-of-bounds-read-in-windows-installer-allows-an-authorized)
- [Microsoft Windows Installer use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-96047-use-after-free-in-windows-installer-allows-an-authorized-attacker)