RCE in Nagios Host
CVE-2026-2043
Nagios Host esensors_websensor_configwizard_func 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 esensors_websensor_configwizard_func method. 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-28249.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.729 (99.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Nagios Host — versions 2026R1
- Nagios Nagios_xi — versions 2026
Weakness classification (CWE)
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
- zdi-disclosures@trendmicro.com (Product, vendor-advisory, Release Notes)
Frequently asked questions
- What is CVE-2026-2043?
- CVE-2026-2043 is a high-severity vulnerability in Nagios Host, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-02-20.
- How severe is CVE-2026-2043?
- High severity. CVSS v3 base score is 8.8 out of 10.