MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport_CVE-2026-39313

{
    "lastseen": "",
    "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.",
    "published": "2026-04-16T21:24:27.328Z",
    "modified": "2026-04-16T21:24:27.328Z",
    "type": "cve",
    "title": "MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport",
    "source": "GitHub_M",
    "references": "https://github.com/QuantGeekDev/mcp-framework/security/advisories/GHSA-353c-v8x9-v7c3\nhttps://github.com/QuantGeekDev/mcp-framework/commit/f97d2bb76d6359faf10cd1fc54b4911476b62524",
    "id": "CVE-2026-39313",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "QuantGeekDev mcp-framework < 0.2.22",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "mcp-framework",
    "version": "< 0.2.22",
    "vendor": "QuantGeekDev",
    "ai_description": "Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport",
    "ai_severity": "High",
    "ai_vendor": "QuantGeekDev",
    "ai_product": "mcp-framework",
    "ai_version": "0.2.21 and below",
    "ai_score": 8.7
}