RCE in Netgate Pfsense Ce
CVE-2026-111226
pfSense CE 2.4.5 through 2.9.0 contains an OS command injection vulnerability that allows authenticated WebGUI users with Advanced Admin Access privilege to execute commands as root via Login Protection settings. Attackers can submit sshguard threshold, block time, or detection time values containing newlines or $(...) that are written unvalidated to sshguard.conf and sourced as root on restart.
Vulnerability class: Command Injection (OS Command Injection)
Published .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/abraxas/pfsense-sshguard-crlf (technical-description, exploit)
- abraxaslabs.tech/research/pfsense-ce-leftovers (technical-description)
- github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/us… (technical-description)
- github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/et… (technical-description)
- www.vulncheck.com/advisories/netgate-pfsense-ce-2.4.5-through-2.9.0-os-command-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111226?
- CVE-2026-111226 is a high-severity vulnerability in Netgate Pfsense Ce, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-10-15.
- How severe is CVE-2026-111226?
- High severity. CVSS v3 base score is 7.2 out of 10.