What is CVE-2026-34205?

CVE-2026-34205 is a critical-severity vulnerability in Home-Assistant Home Assistant Operating System, classified under CWE-923. CVSS score: 9.6/10. Published 2026-03-27.

How severe is CVE-2026-34205?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Vulnerability in Home-Assistant Home Assistant Operating System

CVE-2026-34205

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.

EPSS: 0.003 (17.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Home-assistant Home Assistant Operating System — versions <= 17.1
Home-assistant Home Assistant Supervisor — versions < 2026.03.2

Weakness classification (CWE)

CWE-923

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-34205?: CVE-2026-34205 is a critical-severity vulnerability in Home-Assistant Home Assistant Operating System, classified under CWE-923. CVSS score: 9.6/10. Published 2026-03-27.
How severe is CVE-2026-34205?: Critical severity. CVSS v3 base score is 9.6 out of 10.