CVE-2026-34205

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

State: Published
Severity: 9.7 Critical
Published: Mar 27, 2026
Updated: Apr 1, 2026
Reserved: Mar 26, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.7 Critical	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-923 Improper Restriction of Communication Channel to Intended Endpoints

Affected Products

Product	Versions
Home Assistant Operating Systemhome-assistant	<= 17.1Affected
Home Assistant Supervisorhome-assistant	< 2026.03.2Affected

References

https://github.com/home-assistant/core/security/advisories/GHSA-gh5m-4m97-c95h

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