Advisory Details

March 30th, 2026

NoMachine External Control of File Path Local Privilege Escalation Vulnerability

ZDI-26-248
ZDI-CAN-28630

CVE ID CVE-2026-5054
CVSS SCORE 7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS NoMachine
AFFECTED PRODUCTS NoMachine
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of NoMachine. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the handling of command line parameters. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root.
ADDITIONAL DETAILS

Fixed in NoMachine version 9.4.14
https://kb.nomachine.com/SU03X00271
DISCLOSURE TIMELINE
  • 2026-02-06 - Vulnerability reported to vendor
  • 2026-03-30 - Coordinated public release of advisory
  • 2026-03-30 - Advisory Updated
CREDIT Anonymous
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