How severe is CVE-2026-35491?

CVE-2026-35491 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability low.

Is CVE-2026-35491 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35491?

CVE-2026-35491 affects Pi-hole Ftldns. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35491?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-35491 have an EU (EUVD) identifier?

Yes. CVE-2026-35491 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19676.

When was CVE-2026-35491 published?

CVE-2026-35491 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-35491

CVE-2026-35491 is a medium-severity vulnerability in Pi-hole Ftldns with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19676
Weakness: CWE-863
Affected product: Pi-hole Ftldns
Published: 2026-04-07
Last modified: 2026-06-17

Description

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 to overwrite configuration via a Teleporter archive (authorization bypass). This vulnerability is fixed in 6.6.

Frequently asked questions

What is CVE-2026-35491?: 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 to overwrite configuration via a Teleporter archive (authorization bypass). This vulnerability is fixed in 6.6.
How severe is CVE-2026-35491?: CVE-2026-35491 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability low.
Is CVE-2026-35491 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35491?: CVE-2026-35491 affects Pi-hole Ftldns. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35491?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35491 have an EU (EUVD) identifier?: Yes. CVE-2026-35491 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19676.
When was CVE-2026-35491 published?: CVE-2026-35491 was published on 2026-04-07 and last updated on 2026-06-17.

References

https://github.com/pi-hole/FTL/security/advisories/GHSA-r7g8-3fj7-m5qq

Affected products (1)

cpe:2.3:a:pi-hole:ftldns:*:*:*:*:*:*:*:*

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