CVE-2026-45158

Name: CVE-2026-45158
Creator: NVD / NIST
Published: 2026-05-13T22:16:46.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2026-45158 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.53%

40.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-88

Affected Software

Vendor	Product	Versions
Opnsense	Opnsense	< 26.1.8

References

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

Timeline

Published: May 13, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-45158?

How severe is CVE-2026-45158?

CVE-2026-45158 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2026-45158?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-45158?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST