CVE-2022-41940 Uncaught exception in engine.io
A specially crafted HTTP request causes an uncaught exception in Engine.IO, crashing the Node.js process and denying service to users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-41940?
CVE-2022-41940 is a high-severity denial of service vulnerability in socketio engine.io, published on 22 Nov 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. 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 uses depending packages like socket.io. There is no known workaround except upgrading to a safe version. There are patches for this issue released in versions 3.6.1 and 6.2.1.
Weakness: CWE-248
Which versions are affected by CVE-2022-41940?
4 open source packages ship an affected version, including engine.io. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
engine.io npm | All versions | 3.6.1 |
engine.io npm | All versions | 3.6.1 |
engine.io npm | From 4.0.0 | 6.2.1 |
engine.io npm | From 4.0.0 | 6.2.1 |
Products include Socket Engine.io.
How do I fix CVE-2022-41940?
Upgrade engine.io to a fixed version for your release line: 3.6.1 or 6.2.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-41940 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-41940 exists.
Other vulnerabilities in socketio engine.io
Sources
Also known as AZL-44820, GHSA-r7qp-cfhv-p84w, ROOT-APP-NPM-CVE-2022-41940.