# CVE-2026-119858: Remote Desktop Client heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-119858-heap-based-buffer-overflow-in-remote-desktop-client-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-2026-119858 · Severity: high · CVSS 7.5 · Published 2026-11-10

A heap-based buffer overflow exists in Remote Desktop Client, which enables users to connect to and control remote computers. An attacker on the network can exploit this vulnerability to execute arbitrary code on the affected system without requiring user interaction or authentication, potentially compromising the entire computer.

## Quick answers

**Is CVE-2026-119858 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119858 being exploited in the wild.

**How severe is CVE-2026-119858?** High severity, with a CVSS score of 7.5, published 10 November 2026.

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

**Is there a fix for CVE-2026-119858?** 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-2026-119858 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-119858?** Check whether you run 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 in Remote Desktop Client allows remote code execution via network exploitation. The vulnerability requires network access but no authentication or user interaction. An attacker can trigger the overflow to execute arbitrary code with the privileges of the Remote Desktop Client process.

## Affected products

- Remote Desktop Client

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119858](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119858)