NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability

October 22nd, 2026
ZDI-26-786 ZDI-CAN-30685

CVE ID

CVE-2026-114549

CVSS Score

9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

NoMachine

Affected Products

NoMachine

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of NoMachine. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the web service, which listens on TCP port 4443 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.

Additional Details

Fixed in v10.1.7; 9.9.6; 8.27.1
https://kb.nomachine.com/TR07X11893


Disclosure Timeline

  • 2026-07-24 - Vulnerability reported to vendor
  • 2026-10-22 - Coordinated public release of advisory
  • 2026-10-22 - Advisory Updated

Credit

Sajeeb Lohani

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