CVE-2026-45158 OPNsense: Command Injection via Attacker-Controlled DHCP Config

Critical 9.1 Published 13 May 2026 Updated 14 May 2026

Remote attackers can execute arbitrary code as root via unsanitized DHCP configuration input in OPNsense.

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-2026-45158?

CVE-2026-45158 is a critical command injection vulnerability in opnsense core, published on 13 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, unsanitized user input is passed to the DHCP configuration of the configured interface, which is processed by a shell script, allowing remote code execution as root on the underlying operating system. This vulnerability is fixed in 26.1.8.

Weakness: CWE-88

Which versions are affected by CVE-2026-45158?

It affects 1 product.

Products include Opnsense Opnsense.

How do I fix CVE-2026-45158?

No fix has been published for CVE-2026-45158 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-2026-45158 being exploited?

There is no known exploitation of CVE-2026-45158 in the wild and no public exploit code.

Sources

Also known as GHSA-5rx3-w735-74wm.