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    GHSA-h669-8m4g-r2hc (mcp): Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport

    GHSA-h669-8m4g-r2hc (mcp): Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport

    21-Jul-2026 1
    Originally appeared on RubySec.## Summary An unauthenticated remote attacker can force any MCP Ruby SDK server using MCP::Server::Transports::StreamableHTTPTransport to allocate gigabytes of memory by sending a single oversized JSON-RPC POST. The transport reads the entire HTT...
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