CVE-2026-84194 LibreNMS 23.10.0 before 26.4.0 OS Command Injection via Hostname
Authenticated admins can execute arbitrary OS commands via crafted hostnames in LibreNMS when libvirt discovery is enabled.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84194?
CVE-2026-84194 is a high-severity command injection vulnerability in librenms, published on 1 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2026-84194?
How do I fix CVE-2026-84194?
No fix has been published for CVE-2026-84194 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-84194 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84194 exists.
Sources
Also known as GHSA-jjvr-265m-qmq9, GHSA-wff2-9gjr-95f3.