Netgate pfSense CE up to 2.9.0 DNS Resolver services_unbound_acls.php aclname/aclaction crlf injection

Summaryinfo

A vulnerability was found in Netgate pfSense CE up to 2.9.0. It has been classified as problematic. This affects an unknown part of the file services_unbound_acls.php of the component DNS Resolver. Performing a manipulation of the argument aclname/aclaction results in crlf injection. This vulnerability was named CVE-2026-111227. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Netgate pfSense CE up to 2.9.0. It has been classified as problematic. This affects an unknown code block of the file services_unbound_acls.php of the component DNS Resolver. The manipulation of the argument aclname/aclaction with an unknown input leads to a crlf injection vulnerability. CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-111227 since 10/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/15/2026).

By approaching the search of inurl:services_unbound_acls.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Netgate

Name

• pfSense CE

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9.0

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

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• 🔒
• 🔒

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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