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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 7.8 · pi-holeNVD modified 2026-10-30 20:05
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 6
- https://github.com/pi-hole/pi-hole/security/advisories/GHSA-xch2-4qxw-g5vj x_refsource_confirm
- https://github.com/pi-hole/pi-hole/pull/6719 x_refsource_misc
- https://github.com/pi-hole/pi-hole/commit/85de82dd2b63bf71ecb936177dfb82421d9d2f25 x_refsource_misc
- https://github.com/pi-hole/pi-hole/commit/c1062f43b0de1876321bafac58fba862406366cb x_refsource_misc
- https://github.com/pi-hole/pi-hole/commit/e05dc3f139206fd8d0e4a052dceefb9056533517 x_refsource_misc
- https://github.com/pi-hole/pi-hole/releases/tag/v6.5 x_refsource_misc