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HIGH7.5

PYSEC-2026-1444

H2O Vulnerable to Denial of Service (DoS) and File Write

Details

In h2oai/h2o-3 version 3.46.0.1, the `run_tool` command exposes classes in the `water.tools` package through the `ast` parser. This includes the `XGBoostLibExtractTool` class, which can be exploited to shut down the server and write large files to arbitrary directories, leading to a denial of service.

Are you affected?

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Affected packages

PyPI/h2o
Introduced in: 3.34.0.1

No fixed version published yet for h2o (pip). Pin to a known-safe version or switch to an alternative.

References