CRLF Injection Affecting pi-hole/ftl package, versions [,6.6.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published6 May 2026
- disclosed5 May 2026
- creditanuraagbaishya
Introduced: 5 May 2026
CVE-2026-39849 (opens in a new tab)How to fix?
Upgrade pi-hole/ftl to version 6.6.1 or higher.
Overview
Affected versions of this package are vulnerable to CRLF Injection via the dns.interface configuration field, which accepts newline characters without validation. An attacker can execute arbitrary commands on the host by injecting malicious directives into the generated dnsmasq configuration file through the configuration API. This is only exploitable if no admin password is set, allowing full access to the configuration API without credentials.