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CVE-2026-5029— RCE in Code Runner MCP Server

Quick assessment

Affected
Code Runner MCP Server Code Runner MCP Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Code Runner MCP Server是Jun Han个人开发者的一款多语言代码运行与结果展示工具。 Code Runner MCP Server存在访问控制错误漏洞，该漏洞源于使用--transport http选项运行时，在端口3088上暴露未经身份验证的/mcp JSON-RPC端点，可能导致未经身份验证的远程攻击者调用run-code MCP工具，通过child_process.exec()使用指定语言解释器执行任意源代码，从而以运行服务器的用户权限执行任意代码。

AI Predicted 9.8 Difficulty: Easy EPSS 0.44% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
Code Runner MCP Server Code Runner MCP Server ≤ * affected
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I. Basic Information for CVE-2026-5029

Vulnerability Information
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Vulnerability Title
RCE in Code Runner MCP Server
Source: CVE Program / CVE List V5
Vulnerability Description
A remote code execution vulnerability exists in Code Runner MCP Server when run with the --transport http option, which exposes the /mcp JSON-RPC endpoint without authentication on port 3088. An unauthenticated remote attacker can invoke the run-code MCP tool to supply arbitrary source code and execute it via child_process.exec() using the specified language interpreter. This allows execution of arbitrary code with the privileges of the user running the server. This vulnerability has not been fixed and might affect the project in all versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Code Runner MCP Server 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Code Runner MCP Server是Jun Han个人开发者的一款多语言代码运行与结果展示工具。 Code Runner MCP Server存在访问控制错误漏洞，该漏洞源于使用--transport http选项运行时，在端口3088上暴露未经身份验证的/mcp JSON-RPC端点，可能导致未经身份验证的远程攻击者调用run-code MCP工具，通过child_process.exec()使用指定语言解释器执行任意源代码，从而以运行服务器的用户权限执行任意代码。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Code Runner MCP Server Code Runner MCP Server 0 ~ * -

II. Public POCs for CVE-2026-5029

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III. Intelligence Information for CVE-2026-5029

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Security Blog Posts for CVE-2026-5029 (1)

IV. Related Vulnerabilities

Same weakness: CWE-306