Vulnerability · Published Feb 20, 2026 · Assigned by zdi

CVE-2026-2042Nagios Host monitoringwizard Command Injection Remote Code Execution Vulnerability

High 7.2

In plain English

A high-severity OS command injection in Host from Nagios. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 6.1% (higher than 93% of all known vulnerabilities).

Severity (CVSS 3.0)7.2High

Exploit odds (30 days)6.1%top 6.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Nagios Host monitoringwizard Command Injection Remote Code Execution Vulnerability. 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. Was ZDI-CAN-28245.

Affected products (as reported)

Vendor	Product	Versions
Nagios	Host	2026R1

Weakness: CWE-78 · Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

ZDI-26-071 x_research-advisory
vendor-provided URL vendor-advisory