CVE-2026-40602

MEDIUM

hass-cli: Handling of user-supplied Jinja2 templates

Title source: cna
STIX 2.1

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.

References (2)

Scores

CVSS v3 5.6
EPSS 0.0002
EPSS Percentile 4.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-1336 CWE-94
Status published
Products (2)
home-assistant-ecosystem/home-assistant-cli < 1.0.0
home-assistant-ecosystem/home_assistant_command-line_interface < 1.0.0
Published Apr 21, 2026
Tracked Since Apr 21, 2026