Critical severity · published May 13, 2026
CVE-2026-45158
OPNsense: Command Injection via Attacker-Controlled DHCP Config
9.1
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
core · opnsense
< 26.1.8 · source: vendor
OP
Opnsense · Opnsense
before 26.1.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45158
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45158
Vendor Advisory
https://github.com/opnsense/core/security/advisories/GHSA-5rx3-w735-74wm
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