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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-39313

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

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Status
Published
Published
Updated
Assigning organization
GitHub_M

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

QuantGeekDev mcp-framework

  • < 0.2.22affected

References