Pi-hole up to 6.4.0 /etc/pihole/versions privileges management

Summaryinfo

A vulnerability marked as critical has been reported in Pi-hole up to 6.4.0. The impacted element is an unknown function of the file /etc/pihole/versions. Performing a manipulation results in privileges management. This vulnerability is reported as CVE-2026-33727. The attack requires a local approach. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Pi-hole up to 6.4.0. This affects an unknown code of the file /etc/pihole/versions. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. Version 6.4 has a local privilege-escalation vulnerability allows code execution as root from the low-privilege pihole account. Important context: the pihole account uses nologin, so this is not a direct interactive-login issue. However, nologin does not prevent code from running as UID pihole if a Pi-hole component is compromised. In that realistic post-compromise scenario, attacker-controlled content in /etc/pihole/versions is sourced by root-run Pi-hole scripts, leading to root code execution. This vulnerability is fixed in 6.4.1.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-33727 since 03/23/2026. The exploitability is told to be difficult. Attacking locally is a requirement. Additional levels of successful authentication are required for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 6.4.1 eliminates this vulnerability.

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Productinfo

Name

• Pi-hole

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4.0

Website

• Product: https://github.com/pi-hole/pi-hole/

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