h2oai h2o-3 up to 3.46.0.9/3.46.0.10 REST API Endpoint /99/ImportSQLTable jdbc:postgresql code injection

Summaryinfo

A vulnerability classified as critical was found in h2oai h2o-3 up to 3.46.0.9/3.46.0.10. Affected by this vulnerability is the function jdbc:postgresql of the file /99/ImportSQLTable of the component REST API Endpoint. Executing a manipulation can lead to code injection. This vulnerability appears as CVE-2026-3960. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in h2oai h2o-3 up to 3.46.0.9/3.46.0.10. This vulnerability affects the function jdbc:postgresql of the file /99/ImportSQLTable of the component REST API Endpoint. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at huntr.com. This vulnerability was named CVE-2026-3960 since 03/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 3.46.0.10 eliminates this vulnerability. Applying the patch b9ae2d3c5220db2dc53753357a783e590364d044 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25205). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• h2oai

Name

• h2o-3

Version

• 3.46.0.0
• 3.46.0.1
• 3.46.0.2
• 3.46.0.3
• 3.46.0.4
• 3.46.0.5
• 3.46.0.6
• 3.46.0.7
• 3.46.0.8
• 3.46.0.9
• 3.46.0.10

License

• open-source

Website

• Product: https://github.com/h2oai/h2o-3/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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