Description
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 and included in version 4.1.0 of the `socket.io` 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 `engine.io` package, including those who use depending packages like `socket.io`. This issue was fixed in version 6.4.2 of Engine.IO. There is no known workaround except upgrading to a safe version.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| socketio | engine.io | >= 5.1.0, < 6.4.2 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | engine.io | >= 5.1.0, < 6.4.2 | 6.4.2 | GHSA-q9mw-68c2-j6m5 |
Advisories 2
- WID-SEC-2026-0180 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- WID-SEC-2023-1800 HCL BigFix: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 18, 2023