CVE-2026-33727 — MEDIUM (6.4)

Vulnerability Description

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.

CVSS Score

6.4

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Pi-Hole	Pi-Hole	6.4

Related Weaknesses (CWE)

CWE-269

References

https://github.com/pi-hole/pi-hole/security/advisories/GHSA-c935-8g63-qp74Vendor Advisory

FAQ

What is CVE-2026-33727?

CVE-2026-33727 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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-privileg...

How severe is CVE-2026-33727?

CVE-2026-33727 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33727?

Check the references section above for vendor advisories and patch information. Affected products include: Pi-Hole Pi-Hole.