RCE in Nagios Host
CVE-2026-2042
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.061 (93.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.056 · newest: 0.061 · change: +0.005
Affected products
- Nagios Host — versions 2026R1
- Nagios Xi — versions 2026
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-26-071/ (x_research-advisory, Third Party Advisory)
- www.nagios.com/changelog/nagios-xi/nagios-xi-2026r1-0-1/ (Product, vendor-advisory, Release Notes)
Frequently asked questions
- What is CVE-2026-2042?
- CVE-2026-2042 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-2026-2042?
- High severity. CVSS v3 base score is 8.8 out of 10.