Mermaid Validator MCP

An MCP server that validates Mermaid diagram syntax and identifies diagram types across all major formats. It provides detailed parse-error messages for invalid diagrams without requiring external rendering processes.

→ LF112/mermaid-validator-mcp · listed on glama

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// key findings

✅

No credential exfiltration, no sensitive file access, no obfuscation

Static analysis found nothing flowing your secrets to unexpected places.

✅

Open source with a license and README

Anyone can audit the code, the license is declared, and the publisher documents what it does.

// known CVEs in dependencies3 medium1 low

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

mediummermaid@11.12.3GHSA-87f9-hvmw-gh4p

Mermaid: Improper sanitization of configuration leads to CSS injection

mediummermaid@11.12.3GHSA-ghcm-xqfw-q4vr

Mermaid: Improper sanitization of `classDef` in state diagrams leads to HTML injection

mediummermaid@11.12.3GHSA-xcj9-5m2h-648r

Mermaid: Improper sanitization of `classDefs` in diagrams leads to CSS injection

lowmermaid@11.12.3GHSA-6m6c-36f7-fhxh

Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS

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// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 4 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/lf112-mermaid-validator-mcp-8c0edu)](https://m8ven.ai/mcp/lf112-mermaid-validator-mcp-8c0edu)

commit: af0582fc0f70c816ef2f701452babdc17e89b706

code hash: 1d8b145b8d3247c46a66548a048f8123f67805fa2ebe9aecacb5d71be255cc56

verified: 6/12/2026, 11:47:41 AM

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