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Vulnerability record · CVE-2026-84194 · published 1 September 2026

CVE-2026-84194: OS command injection vulnerability

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.

8.6 CVSS 4.0 High EPSS 1.5% · top 26.3% CWE-78 · OS command injection Deferred
8.6CVSS 4.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
8 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/librenms/librenms/security/advisories/GHSA-wff2-9gjr-95f3
https://www.vulncheck.com/advisories/librenms-23.10.0-before-26.4.0-os-command-injection-via-hostname
https://github.com/librenms/librenms/security/advisories/GHSA-wff2-9gjr-95f3

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Source: NIST National Vulnerability Database (record CVE-2026-84194), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.