CVE-2026-35520

Pi-hole FTL affected by Remote Code Execution (RCE) via dhcp.leaseTime Newline Injection

State: Published
Severity: 8.8 High
Published: Apr 7, 2026
Updated: Apr 9, 2026
Reserved: Apr 3, 2026

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, 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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

Affected Products

Product	Versions
FTLpi-hole	>= 6.0, < 6.6Affected

References

https://github.com/pi-hole/FTL/security/advisories/GHSA-fqv2-qhfh-ghcj

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