MCP TypeScript SDK: HTTP server transports and handlers did not limit request body size or JSON-RPC batch length

Date Oct 27, 2026
Type Vendor advisory
Signal High-risk advisory
Vendor / Product npm · @modelcontextprotocol/sdk
High-risk advisory

Summary

MCP TypeScript SDK: HTTP server transports and handlers did not limit request body size or JSON-RPC batch length

Why it matters

GitHub has published a reviewed security advisory for @modelcontextprotocol/sdk. Prioritize it with other application dependency updates.

Operator check

Check whether @modelcontextprotocol/sdk is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.