How severe is CVE-2026-40602?

CVE-2026-40602 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-40602 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40602?

CVE-2026-40602 affects Home-assistant-ecosystem Home Assistant Command-line Interface. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40602?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40602 have an EU (EUVD) identifier?

Yes. CVE-2026-40602 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24211.

When was CVE-2026-40602 published?

CVE-2026-40602 was published on 2026-04-21 and last updated on 2026-06-17.

CVE-2026-40602

CVE-2026-40602 is a medium-severity vulnerability in Home-assistant-ecosystem Home Assistant Command-line Interface with a CVSS 3.x base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Medium (CVSS 3.x base score 5.6)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24211
Weakness: CWE-94
Affected product: Home-assistant-ecosystem Home Assistant Command-line Interface
Published: 2026-04-21
Last modified: 2026-06-17

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.

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.
How severe is CVE-2026-40602?: CVE-2026-40602 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-40602 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40602?: CVE-2026-40602 affects Home-assistant-ecosystem Home Assistant Command-line Interface. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40602?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40602 have an EU (EUVD) identifier?: Yes. CVE-2026-40602 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24211.
When was CVE-2026-40602 published?: CVE-2026-40602 was published on 2026-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:home-assistant-ecosystem:home_assistant_command-line_interface:*:*:*:*:*:*:*:*

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