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CVE-2026-40602— hass-cli: Handling of user-supplied Jinja2 templates

Quick assessment

Affected
home-assistant-ecosystem home-assistant-cli
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Home Assistant是Home Assistant开源的一套开源的家庭自动化管理系统。该系统主要用于控制家庭自动化设备。 Home Assistant 1.0.0及之前版本存在代码注入漏洞，该漏洞源于使用无限制环境处理Jinja2模板，可能导致用户访问Python内部并超出模板使用范围。

CVSS 5.6 · Medium EPSS 0.14% · P3
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I. Basic Information for CVE-2026-40602

Vulnerability Information
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Vulnerability Title
hass-cli: Handling of user-supplied Jinja2 templates
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Home Assistant 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Home Assistant是Home Assistant开源的一套开源的家庭自动化管理系统。该系统主要用于控制家庭自动化设备。 Home Assistant 1.0.0及之前版本存在代码注入漏洞，该漏洞源于使用无限制环境处理Jinja2模板，可能导致用户访问Python内部并超出模板使用范围。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
home-assistant-ecosystem home-assistant-cli < 1.0.0 -

II. Public POCs for CVE-2026-40602

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III. Intelligence Information for CVE-2026-40602

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IV. Related Vulnerabilities

Same weakness: CWE-94

V. Comments for CVE-2026-40602

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