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CVE-2026-39313— MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport

Quick assessment

Affected
QuantGeekDev mcp-framework
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.

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。

AI Predicted 7.5 Difficulty: Easy EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-39313

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Patches & Fixes for CVE-2026-39313 (1)

Vendor Advisories for CVE-2026-39313 (1)

IV. Related Vulnerabilities

Same vendor: QuantGeekDev
Same weakness: CWE-770