Vulnerabilities in pkg:npm/mcp-framework

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-353c-v8x9-v7c3",
  "modified" : "2026-04-24T20:36:27Z",
  "published" : "2026-04-16T20:44:32Z",
  "aliases" : [ "CVE-2026-39313" ],
  "summary" : "MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport",
  "details" : "### Summary\n\nThe `readRequestBody()` function in `src/transports/http/server.ts` concatenates HTTP request body chunks into a string with no size limit, allowing a remote unauthenticated attacker to crash the server via memory exhaustion with a single large HTTP POST request.\n\n### Details\n\n**File:** `src/transports/http/server.ts`, lines 224-240\n\n```typescript\nprivate async readRequestBody(req: IncomingMessage): Promise<any> {\n    return new Promise((resolve, reject) => {\n      let body = '';\n      req.on('data', (chunk) => {\n        body += chunk.toString();   // No size limit\n      });\n      req.on('end', () => {\n        try {\n          const parsed = body ? JSON.parse(body) : null;\n          resolve(parsed);\n        } catch (error) {\n          reject(error);\n        }\n      });\n      req.on('error', reject);\n    });\n  }\n```\n\nA `maxMessageSize` configuration value exists in `DEFAULT_HTTP_STREAM_CONFIG` (4MB, defined in `src/transports/http/types.ts` line 124) but is never enforced in `readRequestBody()`. This creates a false sense of security.\n\n### PoC\n\nLocal testing with 50MB POST payloads against the vulnerable `readRequestBody()` function:\n\n| Trial | Payload | RSS growth | Time | Result |\n|-------|---------|-----------|------|--------|\n| 1 | 50MB | +197MB | 42ms | Vulnerable |\n| 2 | 50MB | +183MB | 46ms | Vulnerable |\n| 3 | 50MB | +15MB | 43ms | Vulnerable |\n| 4 | 50MB | +14MB | 32ms | Vulnerable |\n| 5 | 50MB | +65MB | 38ms | Vulnerable |\n\nReproducibility: 5/5 (100%)\n\n### Impact\n\n- **Denial of Service:** Any mcp-framework HTTP server can be crashed by a single large POST request to /mcp\n- **No authentication required:** readRequestBody() executes before any auth checks (auth is opt-in, default is no auth)\n- **Dead config:** maxMessageSize exists but is never enforced, giving a false sense of security\n- **Affected:** All applications using mcp-framework HttpStreamTransport (60,000 weekly npm downloads)\n\n**CWE-770:** Allocation of Resources Without Limits or Throttling\n**Suggested CVSS 3.1:** 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\n### Suggested Fix\n\nEnforce `maxMessageSize` in `readRequestBody()`:\n\n```typescript\nprivate async readRequestBody(req: IncomingMessage): Promise<any> {\n    const maxSize = this._config.maxMessageSize || 4 * 1024 * 1024;\n    return new Promise((resolve, reject) => {\n      let body = '';\n      let size = 0;\n      req.on('data', (chunk) => {\n        size += chunk.length;\n        if (size > maxSize) {\n          req.destroy();\n          reject(new Error('Request body too large'));\n          return;\n        }\n        body += chunk.toString();\n      });\n      // ...\n    });\n  }\n```\n\n### Disclosure Timeline\n\nThis report follows coordinated disclosure. I request a 90-day window before public disclosure.\n\n**Reporter:** Raza Sharif, CyberSecAI Ltd (contact@agentsign.dev)",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "mcp-framework"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.2.22"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.2.21"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/QuantGeekDev/mcp-framework/security/advisories/GHSA-353c-v8x9-v7c3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-39313"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/QuantGeekDev/mcp-framework/commit/f97d2bb76d6359faf10cd1fc54b4911476b62524"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/QuantGeekDev/mcp-framework"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T20:44:32Z",
    "nvd_published_at" : "2026-04-16T22:16:38Z"
  }
}