CVE-2026-34205: Home-Assistant Home Assistant Operating System

Critical severity, CVSS 9.6. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Home-Assistant Home Assistant Operating System: up to and including 17.1
• Home-Assistant Home Assistant Supervisor: before 2026.03.2 (fixed in 2026.03.2)

Published 2026-03-27. Last modified 2026-06-17.