CVE-2026-40602 — hass-cli: Handling of user-supplied Jinja2 templates
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 J…
Published: 2026-04-21 · CVSS: 5.6 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7