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.
Weakness
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.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| H2o | H2o | 3.46.0 (including) | 3.46.0 (including) |