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crowdsec

README.md

CrowdSec

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<TL;DR>

CrowdSec is a free, modern, and collaborative behavior detection engine coupled with a global IP reputation network. It stacks on fail2ban's philosophy but is IPV6 compatible and 60x faster (Go vs. Python) and uses Grok patterns to parse logs. CrowdSec is engineered for modern Cloud / Containers / VM-based infrastructures (by decoupling detection and remediation). Once detected, you can remedy threats with various methods (firewall block, Nginx HTTP 403, Captchas, …) while sharing the aggressive IP to CrowdSec Network and improving everyone's security further.

OSS Projects

  • CrowdSec - The open-source and participative IPS able to analyze visitor behavior & provide an adapted response to all kinds of attacks. It also leverages the crowd power to generate a global CTI database to protect the user network.
  • CrowdSec Hub: Host scenarios and parsers for CrowdSec Agent
  • Home Assistant CrowdSec Addons: CrowdSec for home-assistant.io
  • Firewall Bouncer: Crowdsec bouncer written in golang for firewalls

Pinned Loading

  1. crowdsec crowdsec Public

    CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.

    Go 12.7k 577

  2. hub hub Public

    Main repository for crowdsec scenarios/parsers

    Python 226 203

  3. cs-firewall-bouncer cs-firewall-bouncer Public

    Crowdsec bouncer written in golang for firewalls

    Go 176 50

Repositories

Showing 10 of 130 repositories
  • crowdsec-docs Public

    CrowdSec Documentation: Comprehensive guides, tutorials, and references for installing, configuring, and using CrowdSec, an open-source cybersecurity platform. Contributions welcome!

    crowdsecurity/crowdsec-docs’s past year of commit activity
    MDX 42 98 41 12 Updated Mar 10, 2026
  • crowdsec-local-mcp Public

    An MCP exposing prompts and tools to help users write WAF rules, scenarios etc.

    crowdsecurity/crowdsec-local-mcp’s past year of commit activity
    Python 11 MIT 2 1 0 Updated Mar 10, 2026
  • go-sqllexer Public Forked from DataDog/go-sqllexer

    Simple SQL lexer written in Go

    crowdsecurity/go-sqllexer’s past year of commit activity
    Go 0 MIT 8 0 1 Updated Mar 10, 2026
  • hub Public

    Main repository for crowdsec scenarios/parsers

    crowdsecurity/hub’s past year of commit activity
    Python 226 MIT 203 104 (4 issues need help) 81 Updated Mar 10, 2026
  • crowdsec Public

    CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.

    crowdsecurity/crowdsec’s past year of commit activity
    Go 12,738 MIT 577 205 (1 issue needs help) 70 Updated Mar 10, 2026
  • cs-cloudflare-worker-bouncer-install Public template

    Cloudflare Worker allowing to easily install the Cloudflare worker bouncer

    crowdsecurity/cs-cloudflare-worker-bouncer-install’s past year of commit activity
    JavaScript 0 0 0 0 Updated Mar 9, 2026
  • pfSense-pkg-crowdsec Public
    crowdsecurity/pfSense-pkg-crowdsec’s past year of commit activity
    PHP 72 4 30 0 Updated Mar 6, 2026
  • sec-lists Public

    Repository to track keywords & patterns lists used by crowdsec parsers and scenarios

    crowdsecurity/sec-lists’s past year of commit activity
    16 MIT 22 0 3 Updated Mar 6, 2026
  • crowdsec-service-api-sdk-python Public

    Service API Python SDK

    crowdsecurity/crowdsec-service-api-sdk-python’s past year of commit activity
    Python 2 MIT 0 0 1 Updated Mar 3, 2026
  • crowdsec-tracker-api-sdk-python Public

    Live Exploit Tracker API Python SDK

    crowdsecurity/crowdsec-tracker-api-sdk-python’s past year of commit activity
    Python 1 MIT 1 0 1 Updated Mar 3, 2026
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