CVE-2026-119336

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CVE-2026-119336

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

Details: 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.

References: https://github.com/pi-hole/pi-hole/releases/tag/v6.5, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119336.json, https://github.com/pi-hole/pi-hole/security/advisories/GHSA-xch2-4qxw-g5vj, https://nvd.nist.gov/vuln/detail/CVE-2026-119336, https://github.com/pi-hole/pi-hole/commit/85de82dd2b63bf71ecb936177dfb82421d9d2f25, https://github.com/pi-hole/pi-hole/commit/c1062f43b0de1876321bafac58fba862406366cb, https://github.com/pi-hole/pi-hole/commit/e05dc3f139206fd8d0e4a052dceefb9056533517, https://github.com/pi-hole/pi-hole/pull/6719