CVE-2026-25536 @modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.10.0 to 1.25.3, cross-client response data leak when a single McpServer/Server and transport instance is reused across multiple client connections, most commonly in stateless...

CVE-2026-25536

CVE-2026-25536 affects the MCP TypeScript SDK. From versions 1.10.0 through 1.25.3, cross‑client data can leak when a single McpServer/Server and transport instance is reused across multiple client connections (notably in stateless StreamableHTTPServerTransport deployments). The issue arises from...