CVE-2026-35491: FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface

Routine

MEDIUM 6.1UPGRADE

CVE-2026-35491 is a medium-severity flaw (CVSS 6.1) affecting ftldns. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface. From 6.0 to before 6.6, Pi-hole FTL supports a CLI password feature (webserver.api.cli_pw) that creates “CLI” API sessions intended to be read-only for configuration changes. While /api/config correctly blocks CLI sessions from mutating configuration, /api/teleporter allowed Teleporter imports for CLI sessions, enabling a CLI-scoped session

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-04-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: pi-hole

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 16:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

pi-hole ftldns UPGRADE

Affected: >= 6.0 and < 6.6

Fixed in: 6.6

Safe to downgrade to: a release before 6.0

1. Check installed version

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

2. UPGRADE to 6.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ftldns

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 6.0 (Debian / Ubuntu)

apt-cache madison ftldns sudo apt install ftldns=<VERSION_BEFORE_6.0> sudo apt-mark hold ftldns

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

dnf --showduplicates list ftldns sudo dnf downgrade ftldns-<VERSION_BEFORE_6.0> sudo dnf versionlock add ftldns

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-2026-35491?

ftldns: upgrade to 6.6. Exact commands for each OS are on this page.

Is CVE-2026-35491 being exploited?

CVE-2026-35491 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-2026-35491 affect?

CVE-2026-35491 affects ftldns. Severity is medium (CVSS 6.1). FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface. From 6.0 to before 6.6, Pi-hole FTL supports a CLI password feature (webserver.api.cli_pw) that creates “CLI” API sessions intended t

How urgent is CVE-2026-35491?

Priority 28/100. Public exploit reference

Related CVEs

CVE-2026-35517 HIGH 8.8 UPGRADE FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface
CVE-2026-35518 HIGH 8.8 UPGRADE FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface
CVE-2026-35520 HIGH 8.8 UPGRADE FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface
CVE-2026-35521 HIGH 8.8 UPGRADE FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface
CVE-2026-35519 HIGH 8.8 UPGRADE FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface

References

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