CVE-2026-71259 ESPHome external_components file:// Scheme Validation Bypass Leading to Remote Code Execution
An operator-precedence bug in ESPHome's URL validator allows bypassing file:// restrictions, enabling remote code execution via malicious external components.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-71259?
CVE-2026-71259 is a high-severity code injection vulnerability in esphome, published on 5 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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).
Weakness: CWE-184
Which versions are affected by CVE-2026-71259?
How do I fix CVE-2026-71259?
No fix has been published for CVE-2026-71259 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-71259 being exploited?
There is no known exploitation of CVE-2026-71259 in the wild and no public exploit code.
Sources
Also known as GHSA-2g7j-rv69-9w67.