Description
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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
home-assistant Home Assistant Core
Default version status: affected
0 to < 2026.6.0affected
pkg:pypi/homeassistantReferences
- https://github.com/home-assistant/core/releases/tag/2026.6.0 ↗
- https://github.com/home-assistant/core/pull/172368 ↗
- https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752 ↗
- https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload ↗