Mosquitto

Mosquitto is an open-source message broker that implements the MQTT (Message Queuing Telemetry Transport) protocol, a lightweight messaging protocol designed for constrained devices and low-bandwidth, high-latency, or unreliable networks.

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Mosquitto provides a lightweight and scalable message broker for IoT communication using the MQTT protocol.

Mosquitto is an open-source message broker that implements the MQTT (Message Queuing Telemetry Transport) protocol, a lightweight messaging protocol designed for constrained devices and low-bandwidth, high-latency, or unreliable networks. Developed under the Eclipse Foundation, Mosquitto has become a cornerstone in IoT (Internet of Things) ecosystems, enabling efficient communication between devices and applications. The project was initiated in 2010 by Roger Light and has since evolved into a widely adopted solution for IoT messaging.

Mosquitto's simplicity, scalability, and adherence to the MQTT protocol have made it a popular choice for developers and enterprises alike. The broker supports both MQTT v3.1 and v5.0, offering features like message persistence, TLS/SSL encryption, and WebSocket support. Mosquitto's integration with various IoT platforms and its ability to handle millions of concurrent connections make it a robust solution for large-scale deployments.

The project is maintained by a community of contributors and is governed by the Eclipse Foundation's open-source governance model. Despite its strengths, Mosquitto has faced security vulnerabilities, such as CVE-2026-44838, which highlighted the need for rigorous security practices in IoT systems. The broker's continuous development and community support ensure its relevance in the rapidly evolving IoT landscape.

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Who buys this

  • IoT device manufacturers
  • Industrial automation companies
  • Smart home developers
  • Telecommunications providers
  • Enterprise IT departments

Strengths and what to watch

Strengths

  • Supports both MQTT v3.1 and v5.0, ensuring compatibility with a wide range of devices
  • Highly scalable, capable of handling millions of concurrent connections
  • Open-source and community-driven, with active development and support

Watch for

  • Security vulnerabilities, such as CVE-2026-44838, which can expose systems to risks
  • Potential scalability issues in extremely high-throughput environments
  • Dependence on community support for ongoing development and security patches

Recent moves

Key Information

Founded
2010

Frequently Asked Questions

What is Mosquitto used for?

Mosquitto is an open-source message broker that enables IoT device communication using the MQTT protocol. Designed for constrained devices and unreliable networks, it supports MQTT v3.1 and v5.0 with features like TLS encryption and WebSocket support, making it ideal for smart home and industrial IoT applications.

How does Mosquitto handle large-scale IoT deployments?

Mosquitto's lightweight architecture supports millions of concurrent connections, making it suitable for large IoT networks. Its scalability comes from efficient message handling and protocol optimization for low-bandwidth scenarios, though extremely high-throughput environments may require additional tuning to maintain performance.

Is Mosquitto secure for enterprise IoT projects?

While Mosquitto offers TLS/SSL encryption and authentication, it has faced vulnerabilities like CVE-2026-44838. Enterprises should implement rigorous security practices including regular updates and network hardening when deploying Mosquitto in production environments.

What types of companies use Mosquitto?

Mosquitto serves IoT device manufacturers, industrial automation firms, smart home developers, telecom providers, and enterprise IT departments. Its lightweight MQTT implementation makes it particularly valuable for constrained devices in manufacturing, energy, and connected home applications.

How does Mosquitto compare to other MQTT brokers?

Mosquitto stands out for its open-source nature, dual MQTT version support (v3.1 and v5.0), and WebSocket compatibility. While commercial alternatives exist, Mosquitto's community-driven development and proven scalability make it a popular choice for cost-sensitive IoT implementations.

What should I know about Mosquitto's security updates?

Mosquitto's security relies on community patches and the Eclipse Foundation's governance. Users must monitor vulnerabilities like CVE-2026-44838 and apply updates promptly. The project's open-source nature means security responsiveness depends on contributor availability rather than dedicated enterprise support.

Sources

  1. github.com — Mosquitto's open-source nature and community-driven development
  2. cve.mitre.org — Security vulnerability CVE-2026-44838 in Mosquitto
  3. blogs.eclipse.org — Mosquitto's WebSocket support and HTTP server capabilities
  4. iot.eclipse.org — Mosquitto's role in IoT ecosystems and its integration with other Eclipse technologies