Vulnerability Details CVE-2026-111227
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.018
EPSS Ranking 78.8%
CVSS Severity
CVSS v3 Score 5.5
References
- https://abraxaslabs.tech/research/pfsense-ce-leftovers
- https://github.com/abraxas/pfsense-unbound-acl-crlf
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/unbound.inc#L1094-L1112
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/services_unbound_acls.php#L121-L142
- https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-crlf-injection-via-services-unbound-acls-php
Products affected by CVE-2026-111227
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cpe:2.3:a:pfsense:pfsense:-
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cpe:2.3:a:pfsense:pfsense:2.2.6
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cpe:2.3:a:pfsense:pfsense:2.4.4
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cpe:2.3:a:pfsense:pfsense:2.5.2
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cpe:2.3:a:pfsense:pfsense:2.6.0