CVE-2026-45158

OPNsense: Command Injection via Attacker-Controlled DHCP Config

State: Published
Severity: 9.1 Critical
Published: May 13, 2026
Updated: May 14, 2026
Reserved: May 8, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Affected Products

Product	Versions
coreopnsense	< 26.1.8Affected

References

https://github.com/opnsense/core/security/advisories/GHSA-5rx3-w735-74wm

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