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CVE-2026-34205— Home Assistant: Unauthenticated App (Add-on) Endpoints Exposed to Local Network via Host Network Mode

Quick assessment

Affected
home-assistant Home Assistant Operating System
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Home Assistant是Home Assistant开源的一套开源的家庭自动化管理系统。该系统主要用于控制家庭自动化设备。 Home Assistant存在安全漏洞，该漏洞源于配置为主机网络模式的应用程序将未经身份验证的端点暴露给本地网络，可能导致未经授权的访问。

CVSS 9.7 · Critical EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-34205

Vulnerability Information
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Vulnerability Title
Home Assistant: Unauthenticated App (Add-on) Endpoints Exposed to Local Network via Host Network Mode
Source: CVE Program / CVE List V5
Vulnerability Description
Home Assistant is open source home automation software that puts local control and privacy first. Home Assistant apps (formerly add-ons) configured with host network mode expose unauthenticated endpoints bound to the internal Docker bridge interface to the local network. On Linux, this configuration does not restrict access to the app as intended, allowing any device on the same network to reach these endpoints without authentication. Home Assistant Supervisor 2026.03.02 addresses the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道对预期端点的不适当限制
Source: CVE Program / CVE List V5
Vulnerability Title
Home Assistant 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Home Assistant是Home Assistant开源的一套开源的家庭自动化管理系统。该系统主要用于控制家庭自动化设备。 Home Assistant存在安全漏洞，该漏洞源于配置为主机网络模式的应用程序将未经身份验证的端点暴露给本地网络，可能导致未经授权的访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
home-assistant Home Assistant Operating System <= 17.1 -
home-assistant Home Assistant Supervisor < 2026.03.2 -

II. Public POCs for CVE-2026-34205

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III. Intelligence Information for CVE-2026-34205

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Vendor Advisories for CVE-2026-34205 (1)

Same Patch Batch · home-assistant · 2026-03-27 · 3 CVEs total

CVE-2026-33044 Home Assistant has stored XSS in Map-card through malicious device name
CVE-2026-33045 Home Assistant has stored XSS in history-graphs

IV. Related Vulnerabilities

Same vendor: home-assistant
Same weakness: CWE-923

V. Comments for CVE-2026-34205

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