# CVE-2026-39313

> 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.

## Key facts

- **CVE ID:** CVE-2026-39313
- **Published:** 2026-04-16
- **CWE codes:** CWE-770

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39313

## Citation

> AI Analytics. CVE-2026-39313. Retrieved 2026-07-17 from https://api.ai-analytics.org/cve/CVE-2026-39313. Derived from NIST NVD. Licensed CC0.

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