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engine.io@6.2.0 vulnerabilities

The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server

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Direct Vulnerabilities

Known vulnerabilities in the engine.io package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • H
Uncaught Exception

engine.io is a realtime engine behind Socket.IO. It provides the foundation of a bidirectional connection between client and server

Affected versions of this package are vulnerable to Uncaught Exception such that a specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process.

TypeError: Cannot read properties of undefined (reading 'handlesUpgrades')
    at Server.onWebSocket (build/server.js:515:67)

Note: This issue impacts all the users of the engine.io package, including those who uses depending packages like socket.io.

How to fix Uncaught Exception?

Upgrade engine.io to version 6.4.2 or higher.

>=5.1.0 <6.4.2
  • H
Denial of Service (DoS)

engine.io is a realtime engine behind Socket.IO. It provides the foundation of a bidirectional connection between client and server

Affected versions of this package are vulnerable to Denial of Service (DoS). A malicious client could send a specially crafted HTTP request, triggering an uncaught exception and killing the Node.js process.

How to fix Denial of Service (DoS)?

Upgrade engine.io to version 3.6.1, 6.2.1 or higher.

<3.6.1 >=4.0.0 <6.2.1
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