Path Traversal in Home-Assistant Home Assistant Core
CVE-2026-64825
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.006 (45.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L.
Affected products
- Home-assistant Home Assistant Core — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (release-notes)
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-64825?
- CVE-2026-64825 is a critical-severity vulnerability in Home-Assistant Home Assistant Core, classified under Path Traversal. CVSS score: 9.3/10. Published 2026-07-21.
- How severe is CVE-2026-64825?
- Critical severity. CVSS v3 base score is 9.3 out of 10.