A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. The endpoint performs a HEAD request to verify the existence of a specified resource without setting a timeout. An attacker can exploit this by sending multiple requests to an attacker-controlled server that hangs, causing the application to block and become unresponsive to other requests.
The code has a synchronous call to a remote resource, but there is no timeout for the call, or the timeout is set to infinite.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| H2o | H2o | 3.46.0 (including) | 3.46.0 (including) |
This issue can prevent the product from running reliably, since an outage for the remote resource can cause the product to hang. If the relevant code is reachable by an attacker, then this reliability problem might introduce a vulnerability.