Security vulnerabilities and automated fixes for mcp sdk issues
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A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in Anthropic's Model Context Protocol (MCP) TypeScript SDK version 1.24.0. This high-severity flaw (CVE-2026-0621) could allow attackers to craft malicious input that causes catastrophic regex backtracking, freezing the Node.js event loop. The fix involves upgrading to @modelcontextprotocol/sdk version 1.25.2, which patches the vulnerable regex patterns.