CVE-2026-64825: Home-Assistant Home Assistant Core

Critical severity, CVSS 9.3. EPSS: 0.6% chance of exploitation in the next 30 days.

Home Assistant Core before 2026.6.0 contains a path traversal vulnerability that allows unauthenticated attackers to write arbitrary files to any directory on the host filesystem by uploading a crafted backup archive during the initial onboarding window. Attackers can manipulate the 'name' field inside the uploaded archive's backup.json to supply an absolute path, causing pathlib.Path.__truediv__ to discard the configured backup directory prefix and write attacker-controlled content to arbitrary locations, with full filesystem access when the process runs as root.

Affected products

• Home-Assistant Home Assistant Core: before 2026.6.0 (fixed in 2026.6.0)

Published 2026-07-21. Last modified 2026-10-08.