mcpsec
mcpsec is a Python CLI toolchain for security scanning and fuzzing of MCP (Model Context Protocol) servers. It can scan MCP servers via stdio or HTTP, enumerate attack surface, run SAST-like checks (Semgrep rules), and perform runtime fuzzing/generation to find crashes and application-layer vulnerabilities (e.g., SSRF/path traversal/RCE-class indicators), with optional AI-assisted payload generation.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Tool is designed for offensive testing (fuzzing/exploitation assistance), so operational safety matters. Transport security for HTTP is not clearly specified (assumed HTTPS if using https://). Authentication support appears limited to passing a Bearer token header; scope/granularity and secure secret handling details are not described. Dependency hygiene cannot be verified from the provided manifest alone; listed deps look standard but no CVE review is provided.
⚡ Reliability
Best When
You are evaluating your own MCP server/tool ecosystem (including downstream IDE/agent integrations) and can run scans in a controlled/staging environment with safeguards.
Avoid When
You cannot isolate network/file access for the target, cannot handle potential crashes/DoS from fuzzing, or cannot ensure legal/ethical authorization.
Use Cases
- • Assess security of MCP servers you own/have permission to test (runtime scanning, fuzzing, and REPL-style exploitation assistance)
- • Continuously evaluate MCP toolchains for injection/path/SSRF/DoS and related classes of vulnerabilities
- • Generate evidence (PoC/crash cases) and export results to JSON/SARIF for CI workflows
- • Static analysis of MCP codebases using Semgrep rules for common security issues and MCP-specific misconfigurations
Not For
- • Testing MCP servers you do not own or lack explicit permission to test
- • Production exploitation against third parties or unauthorized red-team activity
- • Environments that cannot tolerate active probing (fuzzing can crash servers / create load)
Interface
Authentication
The README indicates HTTP scanning with an Authorization: Bearer TOKEN header, but does not describe OAuth flows, scope granularity, or token lifecycle.
Pricing
Open-source (MIT) CLI; costs are compute/AI-provider usage if using --ai and a configured model provider.
Agent Metadata
Known Gotchas
- ⚠ Active fuzzing/scanning can crash or DoS the target MCP server.
- ⚠ HTTP scanning requires correctly formatted MCP endpoint/transport path and valid Authorization header if enabled on the target.
- ⚠ AI payload generation requires additional setup (mcpsec setup) and may be sensitive to provider/model configuration.
Alternatives
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Scores are editorial opinions as of 2026-03-30.