CVE-2026-40602
5.6 · MEDIUMThe Home Assistant Command-line interface (hass-cli) is a command-line tool for Home Assistant.
Overview
CVE-2026-40602 is a medium-severity vulnerability affecting home-assistant-ecosystem home_assistant_command-line_interface. It was published on April 21, 2026 and has a CVSS 3.1 base score of 5.6 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.6, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from home-assistant-ecosystem. Update home_assistant_command-line_interface to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| home-assistant-ecosystem | home_assistant_command-line_interface | >= 0, < 1.0.0 | Affected |
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Frequently asked questions
What is CVE-2026-40602?
CVE-2026-40602 is a medium-severity vulnerability affecting home-assistant-ecosystem home_assistant_command-line_interface. It was published on April 21, 2026 and has a CVSS 3.1 base score of 5.6 (MEDIUM).
How severe is CVE-2026-40602?
This vulnerability has a CVSS 3.1 base score of 5.6, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-40602?
Check the references section for vendor advisories and patches from home-assistant-ecosystem. Update home_assistant_command-line_interface to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-40602?
CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-40602 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.
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