CVE-2026-39313
CVE-2026-39313 · MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.7 · High · EPSS 0.5% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
mcp-framework
- Versions
- < 0.2.22: Affected
No fix published
mcp-framework npm
- Affected ranges
- SEMVER: < 0.2.22
Update to 0.2.22