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modelcontextprotocol CVE debriefs

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HIGH modelcontextprotocol CVE published 2026-02-04

CVE-2026-25536

CVE-2026-25536 is a HIGH severity vulnerability in the MCP TypeScript SDK, affecting versions 1.10.0 to 1.25.3. The issue allows for cross-client response data leaks when a single McpServer/Server and transport instance is reused across multiple client connections. This is particularly problematic in stateless StreamableHTTPServerTransport deployments. The vulnerability has been patched in version 1.26.0. [truncated]