Nagios Host monitoringwizard Command Injection Remote Code Execution Vulnerability

February 12th, 2026
ZDI-26-071 ZDI-CAN-28245

CVE ID

CVE-2026-2042

CVSS Score

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

Affected Vendors

Nagios

Affected Products

Host

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Nagios Host. Authentication is required to exploit this vulnerability.

The specific flaw exists within the monitoringwizard module. 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.

Additional Details

Nagios has issued an update to correct this vulnerability. More details can be found at:
https://www.nagios.com/changelog/nagios-xi/nagios-xi-2026r1-0-1/

Disclosure Timeline

  • 2025-10-08 - Vulnerability reported to vendor
  • 2026-02-12 - Coordinated public release of advisory
  • 2026-02-12 - Advisory Updated

Credit

Vladislav Berghici of Trend Research

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