CVE-2026-64825
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| home-assistant | Home Assistant Core | 0 < 2026.6.0 | affected |
Weaknesses
- CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
- 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
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