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

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Summary

CVECVE-2026-34205
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-27 20:16:35 UTC
Updated2026-03-30 13:26:29 UTC
DescriptionHome 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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

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

EPSS: 0.000190000 probability, percentile 0.050850000 (date 2026-04-01)

Problem Types: CWE-923 | CWE-923 CWE-923: Improper Restriction of Communication Channel to Intended Endpoints

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.7CRITICALCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Home-assistant Home Assistant Operating System affected <= 17.1 Not specified
CNA Home-assistant Home Assistant Supervisor affected < 2026.03.2 Not specified

References

ReferenceSourceLinkTags
github.com/home-assistant/core/security/advisories/GHSA-gh5m-4m97-c95h [email protected] github.com
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