Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Home-Assistant-Ecosystem | Home Assistant Command-Line Interface | < 1.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/home-assistant-ecosystem/home-assistant-cli/pull/453Issue Tracking
- https://github.com/home-assistant-ecosystem/home-assistant-cli/security/advisoriMitigationVendor Advisory
FAQ
What is CVE-2026-40602?
CVE-2026-40602 is a vulnerability with a CVSS score of 5.6 (MEDIUM). 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 instea...
How severe is CVE-2026-40602?
CVE-2026-40602 has been rated MEDIUM with a CVSS base score of 5.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40602?
Check the references section above for vendor advisories and patch information. Affected products include: Home-Assistant-Ecosystem Home Assistant Command-Line Interface.