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TI-2026-49927 Aliases CVE-2026-71259GHSA-2g7j-rv69-9w67

ESPHome external_components file:// Scheme Validation Bypass Leading to Remote Code Execution

Priority LOW 38CWE-184Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00174 6th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
esphomeesphomeup to 2026.7.0—No fix listedCNA
  • esphome Vendoresphome Affected up to 2026.7.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-71259
  2. 2026-10-03 Alias added: GHSA-2g7j-rv69-9w67

References

Advisory 2

  • TI-2024-17944 ESPHome remote code execution via arbitrary file write CVSS 3.1HIGH 8.8
  • TI-2025-35691 ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header CVSS 3.1HIGH 8.1
  • TI-2024-19201 ESPHome vulnerable to Authentication bypass via Cross site request forgery CVSS 3.1HIGH 8.1
  • TI-2026-42331 ESPHome Device Builder: Renamed auth env vars silently disable dashboard authentication on upgrade CVSS 3.1CRITICAL 9.8
  • TI-2026-19197 ESPHome vulnerable to denial-of-service via out-of-bounds check bypass in the API component CVSS 4.0LOW 1.7
  • TI-2026-81983 ESPHome Device Builder ingress site skips authentication on LAN CVSS 3.1HIGH 8.8
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences