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.
Related Weaknesses (CWE)
References
- https://github.com/QuantGeekDev/mcp-framework/commit/f97d2bb76d6359faf10cd1fc54b
- https://github.com/QuantGeekDev/mcp-framework/security/advisories/GHSA-353c-v8x9
FAQ
What is CVE-2026-39313?
CVE-2026-39313 is a documented vulnerability. 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...
How severe is CVE-2026-39313?
CVSS scoring is not yet available for CVE-2026-39313. Check NVD for updates.
Is there a patch for CVE-2026-39313?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.