What is CVE-2026-45158?

CVE-2026-45158 is a critical-severity vulnerability in Opnsense Core, classified under Argument Injection. CVSS score: 9.1/10. Published 2026-05-13.

How severe is CVE-2026-45158?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Opnsense Core

CVE-2026-45158

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 roo…

EPSS: 0.003 (54.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Opnsense Core — versions < 26.1.8
Opnsense

Weakness classification (CWE)

CWE-88 — Argument Injection

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45158?: CVE-2026-45158 is a critical-severity vulnerability in Opnsense Core, classified under Argument Injection. CVSS score: 9.1/10. Published 2026-05-13.
How severe is CVE-2026-45158?: Critical severity. CVSS v3 base score is 9.1 out of 10.