CVE-2026-64825Network attack vector

Unauthenticated arbitrary file write via backup upload

Published Jul 21, 2026 · Updated Jul 21, 2026

Path traversal in Home Assistant Core before 2026.6.0 allows remote attackers to write arbitrary host files through a crafted backup upload. The backup reader trusts the name field in backup.json, and pathlib path joining treats an absolute value as a replacement for the configured backup directory. The unauthenticated upload route is reachable only during initial onboarding; successful writes inherit the Core process permissions, including full host filesystem access when it runs as root.

CVSS severity9.0
Critical
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Home Assistant Core before 2026.6.0 allows remote attackers to write arbitrary host files through a crafted backup upload. The backup reader trusts the name field in backup.json, and pathlib path joining treats an absolute value as a replacement for the configured backup directory. The unauthenticated upload route is reachable only during initial onboarding; successful writes inherit the Core process permissions, including full host filesystem access when it runs as root.

The record

CVE
CVE-2026-64825
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Home Assistant
Product
Home Assistant Core
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant Coreversion=0 <2026.6.0

Published CVSS scores

9.0VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
9.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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