Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| h2oai | h2oai/h2o-3 | unspecified – ≤ latest | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | ai.h2o:h2o-core | >= 3.2.0.1, <= 3.46.0 | — | GHSA-5c8j-g96x-cj78 |
| PyPI | h2o | >= 3.2.0.1, <= 3.46.0 | — | PYSEC-2026-1438 |