What is CVE-2026-35521?

CVE-2026-35521 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-2026-35521?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Pi-hole Ftl

CVE-2026-35521

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 hosts configuration…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.007 (48.6th percentile) — read the EPSS interpretation.

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.

Affected products

Pi-hole Ftl — versions >= 6.0, < 6.6
Pi-hole Ftldns

Weakness classification (CWE)

CWE-78 — OS Command Injection
CWE-93 — CRLF Injection

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-35521?: CVE-2026-35521 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-2026-35521?: High severity. CVSS v3 base score is 8.8 out of 10.