CVE-2026-40602

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 v3.1 Score

5.6

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0002

Probability of exploitation

0.05%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-94 CWE-94

CWE-1336 CWE-1336

Affected Products

Vendor	Product	Versions
home-assistant-ecosystem	home_assistant_command-line_interface	< 1.0.0

References

Advisories & Patches

https://github.com/home-assistant-ecosystem/home-assistant-cli/security/advisories/GHSA-33qf-q99x-wpm8

Other References

https://github.com/home-assistant-ecosystem/home-assistant-cli/pull/453

Frequently Asked Questions

What is CVE-2026-40602? +

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. It has a CVSS v3.1 base score of 5.6 (MEDIUM).

How severe is CVE-2026-40602? +

CVE-2026-40602 has a CVSS v3.1 score of 5.6 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0002, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-40602? +

CVE-2026-40602 affects products from home-assistant-ecosystem, specifically: home_assistant_command-line_interface. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40602? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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