What is CVE-2026-71259?

CVE-2026-71259 is a high-severity vulnerability in Esphome, classified under Incomplete List of Disallowed Inputs. CVSS score: 8.6/10. Published 2026-08-05.

How severe is CVE-2026-71259?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Esphome

CVE-2026-71259

ESPHome through 2026.7.0-dev contains an operator-precedence bug in the cv.url validator in esphome/config_validation.py. Because binds tighter than , any file: URI passes validation regardless of netloc. This validator gates the field of the external_components YAML directive's git source schema, which is passed to (git supports file:// natively).

EPSS: 0.001 (2.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Esphome — versions 0

Weakness classification (CWE)

CWE-184 — Incomplete List of Disallowed Inputs

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-71259?: CVE-2026-71259 is a high-severity vulnerability in Esphome, classified under Incomplete List of Disallowed Inputs. CVSS score: 8.6/10. Published 2026-08-05.
How severe is CVE-2026-71259?: High severity. CVSS v3 base score is 8.6 out of 10.