CVE-2026-71259Disclosure

LOWCVSS 8.6 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

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).

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-184

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Full discourse1 post

Upwind Security MDR@UpwindMDR47d
Disclosure
🚨High - ESPHome RCE via file:// URL Validator Bypass (CVE-2026-71259) ESPHome’s cv.url() validator has an operator-precedence bug letting file: URIs pass validation. Via the external_components YAML directive, an attacker can point git-clone at file://<local-path> and load a malicious component; when config is processed it executes arbitrary Python code. 👉Affected: esphome <= 2026.7.0-dev
Post summary
The text announces a high‑severity CVE (CVE-2026-71259) in ESPHome, explaining how a validation bug allows attackers to load malicious Python code via external components.
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