Vulnerability · CVE-2026-45158
OPNsense is a FreeBSD based firewall and routing platform.
Published May 13, 2026 · catalog updated Jun 17, 2026 · OPNsense is a FreeBSD
Check if you run it
No confirmed exploitation is on record for CVE-2026-45158. EPSS is 0.82%. Act only if a listed version of OPNsense is a FreeBSD is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (OPNsense is a FreeBSD).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Critical9.1
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.82%
- Remediation
- Advisory link
- Affected products
- cpe opnsense/opnsense
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe opnsense/opnsenseversion unspecified
How to fix CVE-2026-45158
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-45158. EPSS is 0.82%. Act only if a listed version of OPNsense is a FreeBSD is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-88. EPSS 0.82%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
May 13, 2026 · NIST NVD
Detected
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.
Jun 17, 2026 · NIST NVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2026-45158
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-45158
30-day exploitation probability 0.8%
first.org - NIST NVDVulnerability recordCVE-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 root on the underlying operating system. Thi
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.