CVE-2026-34205CWE-923

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

Critical · published March 27, 2026

CVSS v3.1
9.7
EPSS
0%
Percentile
26.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.7 · CRITICAL
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00346 · 26.9th percentile
Weakness
CWE-923 · Improper Restriction of Communication Channel to Intended Endpoints
Published
2026-03-27T19:41Z
EPSS history
Timeline
  • 27 MAR 19:41Z
    Home Assistant: Unauthenticated App (Add-on) Endpoints Exposed to Local Network via Host Network Mode
    cvelistv5