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: 9.7/10. Published 2026-03-27.

How severe is CVE-2026-34205?

Critical severity. CVSS v3 base score is 9.7 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…

EPSS: 0.001 (20.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.7 (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

https://github.com/home-assistant/core/security/advisories/GHSA-gh5m-4m97-c95h (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: 9.7/10. Published 2026-03-27.
How severe is CVE-2026-34205?: Critical severity. CVSS v3 base score is 9.7 out of 10.