RCE in Pi-Hole Ftl
CVE-2026-35520
FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface. From 6.0 to before 6.6, the Pi-hole FTL engine contains a Remote Code Execution (RCE) vulnerability in the DHCP lease time configuration parameter (dhcp.leaseTime). This vulnerability allows an authenticated attacker to inject arbitrary dnsmasq configuration directives through newline characters, ultimately achieving command execution on the underlying system. This vulnerability is fixed in 6.6.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (63.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.010 · change: +0.003
Affected products
- Pi-Hole Ftl — versions >= 6.0, < 6.6
- Pi-Hole Ftldns
Weakness classification (CWE)
References
- github.com/pi-hole/FTL/security/advisories/GHSA-fqv2-qhfh-ghcj (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-35520?
- CVE-2026-35520 is a high-severity vulnerability in Pi-Hole Ftl, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-04-07.
- How severe is CVE-2026-35520?
- High severity. CVSS v3 base score is 8.8 out of 10.