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CVE-2026-0863— Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host.

Quick assessment

Affected
CVE-2026-0863
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n存在安全漏洞，该漏洞源于攻击者可能利用字符串格式化和异常处理绕过python-task-executor沙盒限制，可能导致执行任意Python代码和实例接管。

CVSS 8.5 · High EPSS 9.29% · P95

I. Basic Information for CVE-2026-0863

Vulnerability Information
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Vulnerability Title
Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host.
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
动态执行代码中指令转义处理不恰当(Eval注入)
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n存在安全漏洞，该漏洞源于攻击者可能利用字符串格式化和异常处理绕过python-task-executor沙盒限制，可能导致执行任意Python代码和实例接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

II. Public POCs for CVE-2026-0863

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III. Intelligence Information for CVE-2026-0863

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IV. Related Vulnerabilities

Same weakness: CWE-95

V. Comments for CVE-2026-0863

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