LibreNMS versions >= 23.10.0 and < 26.2.0 (fixed in 26.4.0) contain an authenticated OS command injection vulnerability in libvirt discovery. (CVE-2026-84194)
Description
LibreNMS versions 23.10.0 up to but not including 26.2.0 contain an authenticated OS command injection vulnerability in the libvirt discovery feature. This occurs when libvirt support is enabled, allowing an authenticated admin to inject arbitrary OS commands via a crafted device hostname. The vulnerability is fixed in version 26.4.0.
CVSS v4.0
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An authenticated OS command injection vulnerability exists in LibreNMS versions >= 23.10.0 and < 26.2.0 within the libvirt discovery component. When libvirt support is enabled, the device hostname is concatenated directly into shell commands executed via exec() without proper argument escaping or separation. This allows an authenticated administrator to craft a device hostname that injects arbitrary OS commands, leading to remote code execution in the discovery worker context. The issue is tracked as CVE-2026-84194 and is fixed in version 26.4.0.
Potential Impact
An authenticated administrator can exploit this vulnerability to execute arbitrary operating system commands on the server running LibreNMS. This can lead to remote code execution within the context of the discovery worker, potentially compromising the host system.
Mitigation Recommendations
Upgrade LibreNMS to version 26.4.0 or later where this vulnerability is fixed. Until the upgrade is applied, restrict administrative access to trusted users only and disable libvirt support if not required.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-jjvr-265m-qmq9
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-84194"]
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
Threat ID: 6a96f307acd9273b49e490e7
Added to database: 09/01/2026, 15:45:11 UTC
Last enriched: 09/07/2026, 22:22:05 UTC
Last updated: 10/15/2026, 06:48:19 UTC
Views: 36
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