What’s Vulnerable › Vulnerabilities

CVE-2026-71279: Zigbee2MQTT External JS Extension Path Traversal Leading to Remote Code Execution

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-10-23
• Weakness: CWE-22

Description

Zigbee2MQTT's ExternalJSExtension.getFilePath (lib/extension/externalJS.ts) joins a parameter received via an MQTT message (topic zigbee2mqtt/bridge/request/extension/save) into the extensions base path using path.join(basePath, name) with no sanitization. The extension handler only validates that the name ends in .js/.mjs/.cjs, writes the file, and then dynamically imports it via Node.js import, achieving remote code execution.

Affected products

• Koenkk zigbee2mqtt: through 2.12.0

References

• https://github.com/Koenkk/zigbee2mqtt
• https://github.com/Koenkk/zigbee2mqtt/blob/master/lib/extension/externalJS.ts

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