CVE-2026-18264
Received Received - Intake

Command Injection in NoMachine Remote Desktop

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: Zero Day Initiative

Description
NoMachine getstat Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of NoMachine. Authentication is required to exploit this vulnerability. The specific flaw exists within the web service, which listens on TCP port 4000 by default. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-30634.

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Meta Information

Published
2026-08-20
Last Modified
2026-08-20
Generated
2026-08-20
AI Q&A
2026-08-20
EPSS Evaluated
N/A
NVD
CVE-2026-18264
EUVD
EUVD-2026-63482

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
nomachine getstat *
nomachine nomachine to 8.26.1 (inc)
nomachine nomachine to 9.8.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

CVE-2026-18264 is a remote code execution vulnerability in NoMachine software. It allows authenticated remote attackers to execute arbitrary code on affected systems by exploiting improper validation of user-supplied input in the web service component, which listens on TCP port 4000 by default.

Detection Guidance

Check if NoMachine is running on TCP port 4000 using commands like 'netstat -tulnp | grep 4000' or 'ss -tulnp | grep 4000'. Verify the installed version with 'nomachine --version' or check the service status with 'systemctl status nomachine'.

Impact Analysis

This vulnerability allows attackers to execute arbitrary code with the privileges of the NoMachine service account. If exploited, it could lead to unauthorized access, data theft, or further compromise of the affected system.

Compliance Impact

This vulnerability allows remote attackers with authentication to execute arbitrary code on affected NoMachine installations. Such unauthorized code execution could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR (data protection) and HIPAA (health information privacy).

Mitigation Strategies

Update NoMachine to versions 9.8.2 or 8.26.1 or later immediately. If updating is not possible, restrict access to port 4000 via firewall rules and ensure only trusted users have authentication privileges.

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