Vulnerability-Lookup

CVE-2026-71279 (GCVE-0-2026-71279)

Vulnerability from cvelistv5 – Published: 2026-08-05 12:26 – Updated: 2026-08-10 11:47

Title

Zigbee2MQTT External JS Extension Path Traversal Leading to Remote Code Execution

Summary

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.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-05 15:55 UTC

CWE

CWE-22

Assigner

TuranSec CNA under the redhat root

CNA scorecard C 70/100 over 189 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/Koenkk/zigbee2mqtt	third-party-advisory
https://github.com/Koenkk/zigbee2mqtt/blob/master…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
Koenkk	zigbee2mqtt	Affected: 0 , ≤ 2.12.0 (semver)	guessed

Date Public

2026-08-05 12:26

Credits

Alibek Baxtiyorov

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-71279

Vulnerability from fkie_nvd - Published: 2026-08-05 13:24 - Updated: 2026-10-23 21:10

Severity

8.0 (High) - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c	https://github.com/Koenkk/zigbee2mqtt
	309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c	https://github.com/Koenkk/zigbee2mqtt/blob/master/lib/extension/externalJS.ts

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "zigbee2mqtt",
          "programFiles": [
            "lib/extension/externalJS.ts"
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    },
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      "lang": "es",
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GHSA-77VH-G47P-VH46

Vulnerability from github – Published: 2026-08-05 15:32 – Updated: 2026-08-05 15:32

Details

Zigbee2MQTT's ExternalJSExtension.getFilePath() (lib/extension/externalJS.ts) joins a name 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. Because path.join() resolves ../ sequences, a name such as ../../tmp/evil.js escapes the intended extensions directory. 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. Requires the enable_external_js config option (off by default, but commonly enabled in legacy installs) and MQTT broker access, which is frequently unauthenticated in real deployments. The identical unsanitized getFilePath() is also used by the extension-removal handler, enabling arbitrary file deletion.

Severity

8.0 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

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  "aliases": [
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  ],
  "database_specific": {
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T13:24:52Z",
    "severity": "HIGH"
  },
  "details": "Zigbee2MQTT\u0027s ExternalJSExtension.getFilePath() (lib/extension/externalJS.ts) joins a `name` 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. Because path.join() resolves `../` sequences, a name such as `../../tmp/evil.js` escapes the intended extensions directory. 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. Requires the `enable_external_js` config option (off by default, but commonly enabled in legacy installs) and MQTT broker access, which is frequently unauthenticated in real deployments. The identical unsanitized getFilePath() is also used by the extension-removal handler, enabling arbitrary file deletion.",
  "id": "GHSA-77vh-g47p-vh46",
  "modified": "2026-08-05T15:32:20Z",
  "published": "2026-08-05T15:32:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71279"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Koenkk/zigbee2mqtt"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Koenkk/zigbee2mqtt/blob/master/lib/extension/externalJS.ts"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-71279 (GCVE-0-2026-71279)

FKIE_CVE-2026-71279

GHSA-77VH-G47P-VH46

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