CVE-2026-3960
Description
A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10.
How to fix
- h2o h2o3.46.0.10 or later
- h2o3.46.0.10 or later
- ai.h2o:h2o-core3.46.0.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| h2o h2o | v < 3.46.0.10 | 3.46.0.10 |
| h2oPyPI | v < 3.46.0.10 | 3.46.0.10 |
| ai.h2o:h2o-coreMaven | v < 3.46.0.10 | 3.46.0.10 |
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