CVE-2026-39313
MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | quantgeekdev |
| Product | mcp-framework |
| Published | Apr 16, 2026 |
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Affected Versions
QuantGeekDev / mcp-framework
< 0.2.22