# CVE-2026-83517: Microsoft Windows Media Foundation heap overflow

Source: https://junglewise.ai/threats/cve-2026-83517-heap-based-buffer-overflow-in-microsoft-windows-media-foundation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-83517 · Severity: critical · CVSS 9.8 · Published 2026-10-13

Windows Media Foundation, which handles video and audio playback in Windows, contains a heap buffer overflow vulnerability that can be exploited remotely. An attacker can trigger this flaw by sending specially crafted media files or network traffic, potentially executing arbitrary code with the privileges of the affected system.

Technologies: [Microsoft Windows Media Foundation](https://junglewise.ai/threats/technologies/windows-media-foundation). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-83517 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83517 being exploited in the wild.

**How severe is CVE-2026-83517?** Critical severity, with a CVSS score of 9.8, published 13 October 2026.

**Which products and versions are affected?** Microsoft Windows Media Foundation.

**Is there a fix for CVE-2026-83517?** 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-2026-83517 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-83517?** Check whether you run Microsoft Windows Media Foundation. 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 Windows Media Foundation allows remote code execution via network vectors. The vulnerability can be triggered without authentication, enabling an attacker to gain full code execution on the target system. A patch has been released by Microsoft.

## Affected products

- Microsoft Windows Media Foundation

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83517](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83517)

## Related threats

- [Microsoft Windows Media Foundation heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-96157-heap-based-buffer-overflow-in-microsoft-windows-media-foundation)
- [Microsoft Windows Media Foundation heap buffer overflow](https://junglewise.ai/threats/cve-2026-122168-heap-based-buffer-overflow-in-microsoft-windows-media-foundation)
- [Microsoft Windows Media Foundation privilege escalation via deserialization](https://junglewise.ai/threats/cve-2026-96186-deserialization-of-untrusted-data-in-microsoft-windows-media)
- [Microsoft Windows Media Foundation out-of-bounds read](https://junglewise.ai/threats/cve-2026-70044-out-of-bounds-read-in-microsoft-windows-media-foundation-allows)
- [Microsoft Windows Media Foundation heap buffer overflow](https://junglewise.ai/threats/cve-2026-69601-microsoft-windows-media-foundation-heap-buffer-overflow)