Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1a
- https://github.com/home-assistant/core/pull/172368
- https://github.com/home-assistant/core/releases/tag/2026.6.0
- https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-wri
FAQ
What is CVE-2026-64825?
CVE-2026-64825 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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 crafte...
How severe is CVE-2026-64825?
CVE-2026-64825 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-64825?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.