CVE-2026-39313— MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport
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I. Basic Information for CVE-2026-39313
Vulnerability Information
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Vulnerability Title
MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport
Source: NVD (National Vulnerability Database)
Vulnerability Description
mcp-framework is a framework for building Model Context Protocol (MCP) servers. In versions 0.2.21 and below, the readRequestBody() function in the HTTP transport concatenates request body chunks into a string with no size limit. Although a maxMessageSize configuration value exists, it is never enforced in readRequestBody(). A remote unauthenticated attacker can crash any mcp-framework HTTP server by sending a single large POST request to /mcp, causing memory exhaustion and denial of service. This issue has been fixed in version 0.2.22.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
MCP Framework 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP Framework是Alex Andru个人开发者的一个构建模型上下文协议服务器的TypeScript框架。 MCP Framework 0.2.21及之前版本存在安全漏洞，该漏洞源于HTTP传输中的readRequestBody函数将请求主体块连接成字符串时没有大小限制，可能导致远程未经验证的攻击者通过发送大型POST请求使服务器内存耗尽并导致拒绝服务。
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 |
|---|---|---|---|---|
| QuantGeekDev | mcp-framework | < 0.2.22 | - |
II. Public POCs for CVE-2026-39313
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same weakness: CWE-770
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