PT-2026-61978 · Home Assistant · Home Assistant Core

Harish Kolla · CVE-2026-64825 · Published 2026-07-21 · Updated 2026-07-21

Mitre

CVSS v3.1

9.3

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L

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.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-64825

Affected Products

Home Assistant Core

References · 5

• https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-64825 · Security Note
• https://github.com/home-assistant/core/releases/tag/2026.6.0 · Note
• https://github.com/home-assistant/core/pull/172368 · Note
• https://vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload · Note