Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck

CVE-2026-111227Netgate pfSense CE through 2.9.0 CRLF Injection via services_unbound_acls.php

Medium 5.5

In plain English

A medium-severity security flaw in pfSense CE from Netgate. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.8% (higher than 79% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)1.8%top 20.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Netgate pfSense CE through 2.9.0 contains a CRLF injection vulnerability in services_unbound_acls.php that allows authenticated users with the DNS Resolver: Access Lists privilege to inject Unbound configuration directives. Attackers can embed CR/LF characters in the aclname or aclaction fields written to access_lists.conf to add local-data, local-zone, or forward-zone directives and control DNS answers served to LAN clients.

Affected products (as reported)

Vendor	Product	Versions
Netgate	pfSense CE	0 – through 2.9.0

Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L

References

https://github.com/abraxas/pfsense-unbound-acl-crlf exploit, technical-description
https://abraxaslabs.tech/research/pfsense-ce-leftovers technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/unbound.inc#L1094-L1112 technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/services_unbound_acls.php#L121-L142 technical-description
VulnCheck Advisory: Netgate pfSense CE through 2.9.0 CRLF Injection via services_unbound_acls.php third-party-advisory