# CVE-2026-83688: Microsoft Remote Desktop Client heap overflow

Source: https://junglewise.ai/threats/cve-2026-83688-heap-based-buffer-overflow-in-remote-desktop-client-allows-an  
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-2026-83688 · Severity: high · CVSS 8.8 · Published 2026-10-13

A heap-based buffer overflow vulnerability in the Remote Desktop Client allows an attacker over the network to execute arbitrary code on a user's system without requiring authentication. A successful exploit could result in complete system compromise, including data theft, malware installation, and unauthorized access to sensitive information.

Technologies: [Microsoft Remote Desktop Client](https://junglewise.ai/threats/technologies/remote-desktop-client). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-83688 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83688 being exploited in the wild.

**How severe is CVE-2026-83688?** High severity, with a CVSS score of 8.8, published 13 October 2026.

**Which products and versions are affected?** Microsoft Remote Desktop Client.

**Is there a fix for CVE-2026-83688?** 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-2026-83688 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-83688?** Check whether you run Microsoft Remote Desktop Client. 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 the Remote Desktop Client, exploitable over the network without prior authentication. An attacker can send specially crafted network packets to trigger the overflow and achieve remote code execution. The vulnerability affects the client component and requires network access but no user interaction beyond connecting to a malicious RDP server.

## Affected products

- Microsoft Remote Desktop Client

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83688](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83688)

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