EUVD-2026-21653
GHSA-4399-fg4g-454c
CVSS Vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
NoMachine External Control of File Path Local Privilege Escalation Vulnerability. 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. Was ZDI-CAN-28630.
Analysis
Local privilege escalation in NoMachine allows authenticated low-privileged attackers to execute arbitrary code as root through improper validation of command line path parameters. The vulnerability stems from insufficient sanitization of user-supplied file paths in file operations, enabling path traversal to manipulate privileged system resources. …
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Remediation
Within 24 hours: Identify all systems running NoMachine and document current version numbers across your environment. Within 7 days: Implement access controls restricting NoMachine usage to trusted users only and monitor NoMachine process execution logs for suspicious activity. …
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External POC / Exploit Code
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