# CVE-2026-69350: Microsoft Windows Overlay Filter heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-69350-microsoft-windows-overlay-filter-heap-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-69350 · Severity: medium · CVSS 6.7 · Published 2026-09-08

Windows Overlay Filter is a system component that manages visual overlays in Windows. A heap-based buffer overflow in this component allows an authorized user to execute arbitrary code with elevated privileges, potentially leading to full system compromise.

Technologies: [Microsoft Windows Overlay Filter](https://junglewise.ai/threats/technologies/windows-overlay-filter). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-69350 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69350 being exploited in the wild.

**How severe is CVE-2026-69350?** Medium severity, with a CVSS score of 6.7, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Overlay Filter.

**Is there a fix for CVE-2026-69350?** 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-2026-69350 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-69350?** Check whether you run Microsoft Windows Overlay Filter. 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 vulnerability exists in Windows Overlay Filter that can be exploited by an authorized local user to execute arbitrary code. The vulnerability requires the attacker to have prior local access and execute a specially crafted input to overflow a heap buffer in the filter. Successful exploitation allows privilege escalation to a higher privilege level. A patch from Microsoft is available.

## Affected products

- Microsoft Windows Overlay Filter

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69350](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69350)

## Related threats

- [Windows Overlay Filter race condition privilege escalation](https://junglewise.ai/threats/cve-2026-121670-concurrent-execution-using-shared-resource-with-improper)
- [Microsoft Windows Overlay Filter race condition privilege escalation](https://junglewise.ai/threats/cve-2026-112813-concurrent-execution-using-shared-resource-with-improper)
- [Windows Overlay Filter integer overflow privilege escalation](https://junglewise.ai/threats/cve-2026-112760-integer-overflow-or-wraparound-in-windows-overlay-filter-allows)
- [Microsoft Windows Overlay Filter information disclosure](https://junglewise.ai/threats/cve-2026-108409-exposure-of-sensitive-system-information-to-an-unauthorized)
- [Windows Overlay Filter missing authorization](https://junglewise.ai/threats/cve-2026-96315-missing-authorization-in-windows-overlay-filter-allows-an)