CVE-2026-64825 — Home Assistant Core < 2026.6.0 Path Traversal File Write via Backup Upload
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 filesyste…
Published: 2026-07-21 · CVSS: 9.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7