CVE-2026-40602CWE-1336CWE-94

hass-cli: Handling of user-supplied Jinja2 templates

Medium · published April 21, 2026

CVSS v3.1
5.6
EPSS
0%
Percentile
3.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.6 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00145 · 3.4th percentile
Weaknesses
CWE-1336 · Improper Neutralization of Special Elements Used in a Template Engine; CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-04-21T17:40Z
EPSS history
Timeline
  • 21 APR 17:40Z
    hass-cli: Handling of user-supplied Jinja2 templates
    cvelistv5