Osv Mcp

OSV MCP Server

An MCP (Model Context Protocol) server that provides access to the OSV (Open Source Vulnerabilities) database.

Overview

This project implements an SSE-based MCP server that allows LLM-powered applications to query the OSV database for vulnerability information. The server provides tools for:

Querying vulnerabilities for a specific package version or commit
Batch querying vulnerabilities for multiple packages or commits
Getting detailed information about a specific vulnerability by ID

Installation

Prerequisites

Go 1.21 or later
Task (optional, for running tasks)
ko (optional, for building container images)

Building from source

## Clone the repository
git clone https://github.com/StacklokLabs/osv-mcp.git
cd osv-mcp

## Build the server
task build

Usage

Running with ToolHive (Recommended)

The easiest way to run the OSV MCP server is using ToolHive, which provides secure, containerized deployment of MCP servers:

## Install ToolHive (if not already installed)
## See: https://github.com/stacklok/toolhive#installation

## Enable auto-discovery to automatically configure supported clients
thv config auto-discovery true

## Run the OSV MCP server (packaged as 'osv' in ToolHive)
thv run osv

## List running servers
thv list

## Get detailed information about the server
thv registry info osv

The server will be available to your MCP-compatible clients and can query the OSV database for vulnerability information.

Running from Source

Server Configuration

The server can be configured using environment variables:

MCP_PORT: The port number to run the server on (default: 8080)
- Must be a valid integer between 0 and 65535
- If invalid or not set, the server will use port 8080

Example:

## Run on port 3000
MCP_PORT=3000 ./osv-mcp

## Run on default port 8080
./build/osv-mcp-server

MCP Tools

The server provides the following MCP tools:

query_vulnerability

Query for vulnerabilities affecting a specific package version or commit.

Input Schema:

{
  "type": "object",
  "properties": {
    "commit": {
      "type": "string",
      "description": "The commit hash to query for. If specified, version should not be set."
    },
    "version": {
      "type": "string",
      "description": "The version string to query for. If specified, commit should not be set."
    },
    "package_name": {
      "type": "string",
      "description": "The name of the package."
    },
    "ecosystem": {
      "type": "string",
      "description": "The ecosystem for this package (e.g., PyPI, npm, Go)."
    },
    "purl": {
      "type": "string",
      "description": "The package URL for this package. If purl is used, package_name and ecosystem should not be set."
    }
  }
}

query_vulnerabilities_batch

Query for vulnerabilities affecting multiple packages or commits at once.

Input Schema:

{
  "type": "object",
  "properties": {
    "queries": {
      "type": "array",
      "description": "Array of query objects",
      "items": {
        "type": "object",
        "properties": {
          "commit": {
            "type": "string",
            "description": "The commit hash to query for. If specified, version should not be set."
          },
          "version": {
            "type": "string",
            "description": "The version string to query for. If specified, commit should not be set."
          },
          "package_name": {
            "type": "string",
            "description": "The name of the package."
          },
          "ecosystem": {
            "type": "string",
            "description": "The ecosystem for this package (e.g., PyPI, npm, Go)."
          },
          "purl": {
            "type": "string",
            "description": "The package URL for this package. If purl is used, package_name and ecosystem should not be set."
          }
        }
      }
    }
  },
  "required": ["queries"]
}

get_vulnerability

Get details for a specific vulnerability by ID.

Input Schema:

{
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "The OSV vulnerability ID"
    }
  },
  "required": ["id"]
}

Examples

Querying vulnerabilities for a package

{
  "package_name": "lodash",
  "ecosystem": "npm",
  "version": "4.17.15"
}

Querying vulnerabilities for a commit

{
  "commit": "6879efc2c1596d11a6a6ad296f80063b558d5e0f"
}

Batch querying vulnerabilities

{
  "queries": [
    {
      "package_name": "lodash",
      "ecosystem": "npm",
      "version": "4.17.15"
    },
    {
      "package_name": "jinja2",
      "ecosystem": "PyPI",
      "version": "2.4.1"
    }
  ]
}

Getting vulnerability details

{
  "id": "GHSA-vqj2-4v8m-8vrq"
}

Development

Running tests

task test

Linting

task lint

Formatting code

task fmt

Contributing

We welcome contributions to this MCP server! If you’d like to contribute, please review the CONTRIBUTING guide{:target=“_blank”} for details on how to get started.

If you run into a bug or have a feature request, please open an issue in the repository or join us in the #mcp-servers channel on our community Discord server.