Vulnerability in Pi-hole Ftl
CVE-2026-39849
Pi-hole FTL is the core engine of the Pi-hole network-level advertisement and tracker blocker. In versions before 6.6.1, the `dns.interface` configuration field in Pi-hole FTL accepted newline characters without validation, allowing an att…
Vulnerability class: CRLF Injection
EPSS: 0.001 (25.0th 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 < 6.6.1
- Pi-hole Ftldns — versions 6.6
Weakness classification (CWE)
References
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-39849?
- CVE-2026-39849 is a high-severity vulnerability in Pi-hole Ftl, classified under CRLF Injection. CVSS score: 8.8/10. Published 2026-05-05.
- How severe is CVE-2026-39849?
- High severity. CVSS v3 base score is 8.8 out of 10.