CVE-2026-40602mediumCWE-1336CWE-94

CVE-2026-40602: medium-severity vulnerability in home-assistant-ecosystem home-assistant-cli

hass-cli: Handling of user-supplied Jinja2 templates

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.6epss 0.1%
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.
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
Affected products
home-assistant-ecosystem · home-assistant-cli