CVE-2026-64825 — Vulnerability in homeassistant — CVE Details

CRITICAL

Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding

Published July 21, 2026Updated August 19, 2026Source: osv

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.

Advisory Timeline

First published July 21, 2026 (83 days ago).
Last revised August 19, 2026 — 29 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip

Update homeassistant to 2026.6.0 or later

pip install "homeassistant>=2026.6.0"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

Package	Ecosystem	Affected	Fixed In
homeassistant	pypi	0.10.0, 0.10.1, 0.100.0, 0.100.0b0 (+1579 more)	2026.6.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-22
Path TraversalMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.3 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L

References

Frequently Asked Questions

What is CVE-2026-64825?: Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.3/10).
How do I check if my project is affected by CVE-2026-64825?: CVE-2026-64825 affects homeassistant. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-64825 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.3

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-5hxg-r395-fqxx

PYSEC-2026-3669

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