FKIE_CVE-2026-0863

Vulnerability from fkie_nvd - Published: 2026-01-18 16:15 - Updated: 2026-02-10 17:23
Severity ?
8.5 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
Using string formatting and exception handling, an attacker may bypass n8n's python-task-executor sandbox restrictions and run arbitrary unrestricted Python code in the underlying operating system. The vulnerability can be exploited via the Code block by an authenticated user with basic permissions and can lead to a full n8n instance takeover on instances operating under "Internal" execution mode. If the instance is operating under the "External" execution mode (ex. n8n's official Docker image) - arbitrary code execution occurs inside a Sidecar container and not the main node, which significantly reduces the vulnerability impact.
References
reefs@jfrog.comhttps://github.com/n8n-io/n8n/commit/b73a4283cb14e0f27ce19692326f362c7bf3da02Patch
reefs@jfrog.comhttps://research.jfrog.com/vulnerabilities/n8n-python-runner-sandbox-escape-jfsa-2026-001651077/Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.smartkeyss.com/post/cve-2026-0863-python-sandbox-escape-in-n8n-via-exception-formatting-and-implicit-code-executionExploit, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://research.jfrog.com/vulnerabilities/n8n-python-runner-sandbox-escape-jfsa-2026-001651077/Exploit, Third Party Advisory
Impacted products
Vendor Product Version
n8n n8n *
n8n n8n *
n8n n8n *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Using string formatting and exception handling, an attacker may bypass n8n\u0027s python-task-executor sandbox restrictions and run arbitrary unrestricted Python code in the underlying operating system.\n\nThe vulnerability can be exploited via the Code block by an authenticated user with basic permissions and can lead to a full n8n instance takeover on instances operating under \"Internal\" execution mode.\n\nIf the instance is operating under the  \"External\" execution mode (ex. n8n\u0027s official Docker image) - arbitrary code execution occurs inside a Sidecar container and not the main node, which significantly reduces the vulnerability impact."
    },
    {
      "lang": "es",
      "value": "Usando formato de cadenas y manejo de excepciones, un atacante puede eludir las restricciones del sandbox python-task-executor de n8n y ejecutar c\u00f3digo Python arbitrario sin restricciones en el sistema operativo subyacente.\n\nLa vulnerabilidad puede ser explotada a trav\u00e9s del bloque de C\u00f3digo por un usuario autenticado con permisos b\u00e1sicos y puede llevar a una toma de control completa de la instancia de n8n en instancias que operan bajo el modo de ejecuci\u00f3n \u0027Internal\u0027.\n\nSi la instancia est\u00e1 operando bajo el modo de ejecuci\u00f3n \u0027External\u0027 (ej. la imagen oficial de Docker de n8n) - la ejecuci\u00f3n de c\u00f3digo arbitrario ocurre dentro de un contenedor Sidecar y no en el nodo principal, lo que reduce significativamente el impacto de la vulnerabilidad."
    }
  ],
  "id": "CVE-2026-0863",
  "lastModified": "2026-02-10T17:23:41.550",
  "metrics": {
    "cvssMetricV31": [
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          "confidentialityImpact": "HIGH",
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
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  ]
}


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