OS Command Injection Vulnerability in pfSense by Netgate
CVE-2026-111226

8.6HIGH

Key Information:

Vendor

Netgate

Status
Pfsense Ce
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111226?

The OS command injection vulnerability in pfSense CE versions 2.4.5 through 2.9.0 allows users with Advanced Admin Access to execute arbitrary commands as root. By manipulating settings within the Login Protection configuration, specifically the sshguard thresholds (such as block time or detection time) to include newlines or shell command substitutions, authenticated attackers can modify the sshguard.conf file. This unvalidated input, when executed, can lead to command execution with root privileges upon system restart, posing significant security risks to the affected systems.

Affected Version(s)

pfSense CE 2.4.5 <= 2.9.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-111226 - Proof of Concept

References

https://github.com/abraxas/pfsense-sshguard-crlf
exploittechnical-description
https://abraxaslabs.tech/research/pfsense-ce-leftovers
technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a...
technical-description

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Abraxas Labs
.