CVE-2026-64825: Homeassistant Path Traversal Vulnerability

CRITICAL
Advisory Identifier: GHSA-5hxg-r395-fqxx
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CVSS 9.3
CWE-22
Published
Advisory Summary

CVE-2026-64825 is a CRITICAL (CVSS 9.3) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Homeassistant libraries in the PyPI ecosystem. The issue involves home assistant core vulnerable to path traversal via backup upload during onboarding. Remediation is available by upgrading affected packages to version 2026.6.0.

CVE-2026-64825 at a Glance

CVE Identifier CVE-2026-64825
GHSA Identifier GHSA-5hxg-r395-fqxx
Severity CRITICAL
CVSS v3.1 Base Score 9.3
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Homeassistant
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality None (C:N)
Integrity High (I:H)
Availability Low (A:L)

How to Fix CVE-2026-64825

To remediate this vulnerability, upgrade all affected Homeassistant dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

homeassistant fixed: 2026.6.0 
pip install homeassistant>=2026.6.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show homeassistant

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-64825, inspect your installed packages using pip:

pip show homeassistant

Analyze the terminal output to locate any version of Homeassistant in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2026.6.0), your application is affected.

Note: The pip show homeassistant command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Homeassistant, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-64825 Affected Homeassistant Versions

1 component(s)
Fixed Versions:
2026.6.0
Product / Package Ecosystem Affected Versions Fixed Version
homeassistant
pypi/homeassistant
PyPI
< 2026.6.0
2026.6.0

References

NVD — CVE-2026-64825 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64825
Homeassistant Source Repository REPOSITORY
https://github.com/home-assistant/core/pull/172368
Security Fix Commit FIX COMMIT
https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752
Homeassistant Source Repository REPOSITORY
https://github.com/home-assistant/core
Homeassistant Release RELEASE
https://github.com/home-assistant/core/releases/tag/2026.6.0
www.vulncheck.com/advisories/home-ass... WEB
https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload

Frequently Asked Questions

What is CVE-2026-64825?
CVE-2026-64825 is a security vulnerability in Homeassistant involving Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Homeassistant versions are affected?
Affected versions include releases prior to 2026.6.0 across affected packages: homeassistant.
What version fixes CVE-2026-64825?
Upgrading to 2026.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is homeassistant affected?
Yes, homeassistant is affected in releases prior to 2026.6.0. Upgrade your dependency to 2026.6.0 or later.
What is the CVSS score of CVE-2026-64825?
CVE-2026-64825 has a CVSS v3.1 base score of 9.3 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L.
What CWE is associated with CVE-2026-64825?
CVE-2026-64825 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check PyPI dependencies for CVE-2026-64825?
Run the dependency tree command: 'pip show homeassistant'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5hxg-r395-fqxx",
  "modified" : "2026-08-13T18:37:34Z",
  "published" : "2026-07-21T18:31:02Z",
  "aliases" : [ "CVE-2026-64825" ],
  "summary" : "Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "homeassistant"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2026.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-64825"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/home-assistant/core/pull/172368"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/home-assistant/core"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/home-assistant/core/releases/tag/2026.6.0"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-13T18:37:34Z",
    "nvd_published_at" : "2026-07-21T16:17:21Z"
  }
}