vinkius-labs/mcp-fusion

v3.1.25 Security

This release includes 1 security fix for security teams reviewing exposed deployments.

Published 4mo MCP Developer Tools

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✓ No known CVEs patched

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This release patches 1 known CVE

Topics

chatgpt claude mcp mcp-framework mcp-server mcp-tools

+1 more

model-context-protocol

Affected surfaces

auth rbac

Summary

AI summary

Fixed FSM gate bypass on tool calls and added bounded LRU snapshot store limiting memory usage.

Full changelog

Fixed

*FSM gate enforcement on \ ools/call* (Bug #107): \ServerAttachment\ \createToolCallHandler\ now enforces the FSM State Gate at dispatch — previously only filtered \ ools/list, allowing clients that knew a tool's name to bypass the gate and call it regardless of FSM state. Rejected calls return a structured \ oolError('FORBIDDEN')\ with current state, blocked tool name, and available actions.
Bounded FSM snapshot store (Bug #108): \ServerAttachment\ in-memory FSM snapshot store now uses a bounded LRU map (max 10,000 entries) — previously used an unbounded \Map\ that never evicted entries, causing linear memory growth proportional to unique session count in long-running servers.

Security Fixes

FSM gate now enforced on tool call dispatch, preventing bypass of state checks (Bug #107)

View diff on GitHub

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About vinkius-labs/mcp-fusion

A TypeScript framework for building production-ready MCP servers with automatic tool discovery, multi-transport support (stdio/SSE/HTTP), built-in validation, and zero-config setup.

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Related context

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Earlier breaking changes

v4.0.0 All packages now published under the `@mcpfusion` npm scope.
v4.0.0 GitHub repository renamed to vinkius-labs/mcpfusion; npm packages under @mcpfusion scope.
v4.0.0 All source code, documentation, CLI output, workflows, and npm packages now use the @mcpfusion scope.