CVE-2026-71259

8.6 HIGHpublic exploit available

Published 2026-08-05 · Updated 2026-08-10

AI risk analysis

Summary: The flaw is an operator-precedence bug in the cv.url validator, allowing any file: URI to pass validation, which can lead to unauthorized access to external components.
Exploitability: Exploitation is relatively easy as any file: URI can bypass validation, requiring only the correct URI format.
Blast radius: If exploited, this could lead to unauthorized access to local files, potentially allowing attackers to execute arbitrary code or modify system configurations.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the fixed version 2026.7.0 or later.

auth-bypassfile-accessvalidation-bug

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

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 vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weaknesses

CWE-184

Public exploit & PoC references

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.