CVE-2026-111228: Netgate pfSense CE from 2.7.1 through 2.9.0 contains a CRLF injection vulnerability in services_unbound_advanc

Routine

MEDIUM 5.5UPGRADE

CVE-2026-111228 is a medium-severity flaw (CVSS 5.5) affecting pfsense. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Netgate pfSense CE from 2.7.1 through 2.9.0 contains a CRLF injection vulnerability in services_unbound_advanced.php that allows authenticated users with DNS Resolver: Advanced privilege to inject Unbound directives. Attackers can embed CR/LF characters in the unvalidated sock_queue_timeout parameter, which is written raw into unbound.conf, to override local records and forwarding for all clients.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-93
Published	2026-10-15
Last modified	2026-10-19

Publisher (CNA): VulnCheck · Vendor: pfsense

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-15 19:17 UTCPublished CVE record published
2026-10-19 20:42 UTCUpdated Record last modified

pfsense pfsense UPGRADE

Affected: >= 2.7.1 and <= 2.9.0

Fixed in: newer than 2.9.0

Safe to downgrade to: a release before 2.7.1

1. Check installed version

apt-cache policy pfsense || rpm -q pfsense || pfsense --version

2. UPGRADE to newer than 2.9.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pfsense

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pfsense

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.7.1 (Debian / Ubuntu)

apt-cache madison pfsense sudo apt install pfsense=<VERSION_BEFORE_2.7.1> sudo apt-mark hold pfsense

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pfsense sudo dnf downgrade pfsense-<VERSION_BEFORE_2.7.1> sudo dnf versionlock add pfsense

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-111228?

pfsense: upgrade to newer than 2.9.0. Exact commands for each OS are on this page.

Is CVE-2026-111228 being exploited?

CVE-2026-111228 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-111228 affect?

CVE-2026-111228 affects pfsense. Severity is medium (CVSS 5.5). Netgate pfSense CE from 2.7.1 through 2.9.0 contains a CRLF injection vulnerability in services_unbound_advanced.php that allows authenticated users with DNS Resolver: Advanced privilege to inject Unbound directives. Attackers can embed CR/

How urgent is CVE-2026-111228?

Priority 39/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities · pfSense and OPNsense vulnerabilities

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References

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