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Vulnerability · Published Oct 30, 2026 · Assigned by GitHub_M

CVE-2026-119336Pi-hole: arbitrary root file clobber / chmod / disclosure via updatecheck.sh cron following /etc/pihole/versions symlink

High 7.8

In plain English

A high-severity security flaw in pi-hole from pi-hole. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 83.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Pi-hole is a DNS sinkhole that protects devices from unwanted content without installing any client-side software. From 6.4.2 until 6.5, the root-run advanced/Scripts/updatecheck.sh cron job applies truncate -s 0 and chmod 644 to /etc/pihole/versions while following symbolic links in a directory owned by the pihole user. An attacker executing as pihole can replace that path with a symlink so the scheduled root operations truncate or create an arbitrary root-owned file, or race the operations so chmod makes a sensitive target world-readable without truncating it. This issue is fixed in version 6.5.

Affected products (as reported)

VendorProductVersions
pi-hole pi-hole >= 6.4.2, < 6.5

Weakness: CWE-59, CWE-61 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References