# CVE-2026-119929: Windows Installer use-after-free privilege escalation

Source: https://junglewise.ai/threats/cve-2026-119929-use-after-free-in-windows-installer-allows-an-authorized  
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-2026-119929 · Severity: high · CVSS 7.8 · Published 2026-11-10

Windows Installer, a core system component responsible for installing and managing software on Windows machines, contains a use-after-free vulnerability that allows an attacker with local system access to escalate their privileges. An authorized attacker exploiting this flaw could gain elevated system-level permissions, potentially compromising the entire system.

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

## Quick answers

**Is CVE-2026-119929 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119929 being exploited in the wild.

**How severe is CVE-2026-119929?** 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-2026-119929?** 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-2026-119929 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-119929?** 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 use-after-free vulnerability exists in Windows Installer where freed memory is accessed after deallocation. An authorized local attacker with execution capabilities can trigger this condition during installer operations to achieve arbitrary privilege escalation. No evidence of active exploitation in the wild has been reported.

## Affected products

- Microsoft Windows Installer

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119929](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119929)

## 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)
- [Windows Installer heap-based buffer overflow allows privilege elevation](https://junglewise.ai/threats/cve-2026-96085-heap-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)