Skip to main content

Uncaught Exception


Severity Medium
Score 6.5/10


Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. An uncaught exception vulnerability was introduced in version 5.1.0 of the `` package and included in version 4.1.0 of the `` parent package. Older versions are not impacted. A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process. This impacts all the users of the `` package, including those who use depending packages like ``. This issue was fixed in version 6.4.2 of Engine.IO. There is no known workaround except upgrading to a safe version.

  • LOW
  • NONE
  • NONE
  • LOW
  • NONE
  • HIGH

CWE-248 - Uncaught Exception

An exception is thrown from a function, but it is not caught.

Advisory Timeline

  • Published