Model Context Protocol Through The Agent Stack Lens: What Broke, What's Fixed July 28, and What to Check Before Your Next mcp.json
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A design decision baked into the Model Context Protocol (MCP) SDKs—Python, TypeScript, Java, Rust—allows arbitrary shell command execution via STDIO transport when an attacker controls the configuration file, now tracked as CVE-2026-30623. OX Security found over 200,000 vulnerable instances across 150 million downloads, and Anthropic declined to fix the behavior, calling it intentional. The flaw compresses security review out of the tool integration process, as a single mcp.json block can grant unfettered database access without the customary sign-off, and tool poisoning via description fields presents a separate attack vector.