CVE-2026-34205

CRITICAL9.7

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

Published Mar 27, 2026

Modified Yesterday

Details

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.

References

WEB

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

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-34205

CVSS Analysis

CVSS v3.1

9.6

Exploitability

Attack Vector

AdjacentAV:A

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

ChangedS:C

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

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

Weakness Type (CWE)

Other

CWE-923

Ecosystems

Timeline

PublishedMar 27, 2026

ModifiedApr 1, 2026