CVE-2026-34205: Home Assistant: Unauthenticated App (Add-on) Endpoints Exposed to Local Network via Host Network Mode
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34205?
CVE-2026-34205 is classified as a moderate severity vulnerability.
How do I fix CVE-2026-34205?
To fix CVE-2026-34205, reconfigure affected Home Assistant apps to not use host network mode.
Who is affected by CVE-2026-34205?
CVE-2026-34205 affects installations of Home Assistant Supervisor version prior to 2026.03.02.
What is the impact of CVE-2026-34205?
The impact of CVE-2026-34205 allows unauthenticated access to certain endpoints on the local network.
Is there a workaround for CVE-2026-34205?
A temporary workaround for CVE-2026-34205 is to disable or limit access to host network mode for critical apps.