High severity · published Sep 1, 2026
CVE-2026-84194
LibreNMS 23.10.0 before 26.4.0 OS Command Injection via Hostname
8.6
CVSS
1.5%
EPSS
No
On KEV
Description
LibreNMS versions >= 23.10.0 and < 26.2.0 (fixed in 26.4.0) contain an authenticated OS command injection vulnerability in libvirt discovery. When libvirt support is enabled (enable_libvirt=true), the device hostname ($this->getDevice()->hostname) is concatenated into shell commands (ssh, virsh list/dumpxml/domstate) in VminfoLibvirt.php and passed to exec() without escapeshellarg() or argument separation. An authenticated admin can set a crafted device hostname to inject arbitrary OS commands, leading to remote code execution in the discovery worker context.
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
librenms · librenms
23.10.0 before 26.4.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84194
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84194
github.com
https://github.com/librenms/librenms/security/advisories/GHSA-wff2-9gjr-95f3
www.vulncheck.com
https://www.vulncheck.com/advisories/librenms-23.10.0-before-26.4.0-os-command-injection-via-hostname
More from librenms
9.8
CVE-2026-86426
LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion
9.8
CVE-2022-4070
Insufficient Session Expiration in GitHub repository librenms/librenms prior to 22.10.0
9.8
CVE-2022-29712
LibreNMS v22.3.0 was discovered to contain multiple command injection vulnerabilities via the service_ip, hostname, and service_param parameters
9.8
CVE-2021-44278
Librenms 21.11.0 is affected by a path manipulation vulnerability in includes/html/pages/device/showconfig.inc.php
9.8
CVE-2019-10665
An issue was discovered in LibreNMS through 1.47