CVE-2026-64825: Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding
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.
Published Jul 21, 2026 · Updated Aug 13, 2026
Affected packages
homeassistant
- Ecosystem
- PyPI
- Affected
- < 2026.6.0
- Fixed in
- 2026.6.0
- Check
pip show homeassistant
Advisory details
From the GitHub Advisory Database (CC BY 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.
Credited to PercevalFox.
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-64825
- https://github.com/home-assistant/core/pull/172368
- https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752
- https://github.com/home-assistant/core/releases/tag/2026.6.0
- https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload
- https://github.com/advisories/GHSA-5hxg-r395-fqxx
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology