CVE-2026-71279Zigbee2MQTT External JS Extension Path Traversal Leading to Remote Code Execution
Updated under an hour ago ()
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It affects Koenkk zigbee2mqtt. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-22
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- TuranSec
- NVD analysis
- Deferred
- Record last updated
- Aug 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Koenkk zigbee2mqtt koenkk:zigbee2mqtt (from the name) | through 2.12.0 | CNA record |
References
- https://github.com/Koenkk/zigbee2mqttthird-party-advisory
- https://github.com/Koenkk/zigbee2mqtt/blob/master/lib/extension/externalJS.tsthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.