Remote Code Execution in h2oai/h2o-3

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Summary

CVECVE-2026-3960
StatePUBLISHED
Assigner@huntr_ai
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-23 10:16:17 UTC
Updated2026-04-23 10:16:17 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.0 5.9 MEDIUM from [email protected]

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-94 | CWE-94 CWE-94 Improper Control of Generation of Code

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.0CNADECLARED5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA H2oai H2oai/h2o-3 affected unspecified 3.46.0.10 custom Not specified

References

ReferenceSourceLinkTags
github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044 [email protected] github.com
huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d [email protected] huntr.com
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