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.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-64825 ↗
- github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752 ↗
- github.com/home-assistant/core/pull/172368 ↗
- github.com/home-assistant/core/releases/tag/2026.6.0 ↗
- www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.