CVE-2025-5662: h2oai h2oai/h2o-3

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

A deserialization vulnerability exists in the H2O-3 REST API (POST /99/ImportSQLTable) that affects all versions up to 3.46.0.7. This vulnerability allows remote code execution (RCE) due to improper validation of JDBC connection parameters when using a Key-Value format. The vulnerability is present in the MySQL JDBC Driver version 8.0.19 and JDK version 8u112. The issue is resolved in version 3.46.0.8.

Affected products

• h2oai h2oai/h2o-3: before 3.46.0.8 (fixed in 3.46.0.8)

Published 2025-09-02. Last modified 2026-06-17.