CRLF Injection Vulnerability in Netgate pfSense CE
CVE-2026-111228

5.1MEDIUM

Key Information:

Vendor

Netgate

Status
Pfsense Ce
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111228?

Netgate pfSense CE versions 2.7.1 to 2.9.0 are affected by a CRLF injection vulnerability located in services_unbound_advanced.php. Authenticated users with DNS Resolver: Advanced privileges can exploit this flaw by injecting CR/LF characters into the unvalidated sock_queue_timeout parameter. This vulnerability allows attackers to alter the unbound.conf configuration file, overriding local DNS records and forwarding for all clients, potentially putting network security at risk.

Affected Version(s)

pfSense CE 2.7.1 <= 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-2026-111228 - Proof of Concept

References

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

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
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
.