CVE-2026-40602
Medium
Description
The Home Assistant Command-line interface (hass-cli) is a command-line tool for Home Assistant. Up to 1.0.0 of home-assitant-cli an unrestricted environment was used to handle Jninja2 templates instead of a sandboxed one. The user-supplied input within Jinja2 templates was rendered locally with no restrictions. This gave users access to Python's internals and extended the scope of templating beyond the intended usage. This vulnerability is fixed in 1.0.0.
SeverityMedium
CVSS5.6
Exploit probability—
ProductHome-assistant-ecosystem Home Assistant Command-line Interface
PublishedApr 21, 2026
First seenApr 21, 2026
Weakness typeCWE-94Code injectionCWE-1336CWE-1336
How to fix
Update
- home-assistant-ecosystem home_assistant_command-line_interface1.0.0 or later
- homeassistant-cli1.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| home-assistant-ecosystem home_assistant_command-line_interface | v < 1.0.0 | 1.0.0 |
| homeassistant-cliPyPI | v < 1.0.0 | 1.0.0 |
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