High 8.6Published Aug 5, 2026

CVE-2026-71259ESPHome external_components file:// Scheme Validation Bypass Leading to Remote Code Execution

Updated under an hour ago (2026-10-19 07:23 UTC)

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Exploited in the last 30 days

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).

CVSS: 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-184
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: TuranSec
NVD analysis: Deferred
Record last updated: Aug 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

esphome esphome esphome:esphome (from the name)	through 2026.7.0	CNA record

References

https://github.com/esphome/esphomethird-party-advisory
https://github.com/esphome/esphome/blob/dev/esphome/config_validation.pythird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.