High severityNVD Advisory· Published Apr 16, 2026· Updated Apr 29, 2026
CVE-2026-39313
CVE-2026-39313
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
mcp-frameworknpm | < 0.2.22 | 0.2.22 |
Affected products
2Patches
Vulnerability mechanics
References
4News mentions
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