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.
Published: 2026-04-23
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-qmcv-hh7c-3m56 H2O-3 is Vulnerable to Code Injection
History

Tue, 19 May 2026 22:00:00 +0000

Type Values Removed Values Added
First Time appeared H2o
H2o h2o
CPEs cpe:2.3:a:h2o:h2o:*:*:*:*:*:*:*:*
Vendors & Products H2o
H2o h2o
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Tue, 28 Apr 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared H2oai
H2oai h2o-3
Vendors & Products H2oai
H2oai h2o-3

Thu, 23 Apr 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 23 Apr 2026 10:00:00 +0000

Type Values Removed Values Added
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.
Title Remote Code Execution in h2oai/h2o-3
Weaknesses CWE-94
References
Metrics cvssV3_0

{'score': 5.9, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2026-04-23T12:29:32.439Z

Reserved: 2026-03-11T12:52:45.232Z

Link: CVE-2026-3960

cve-icon Vulnrichment

Updated: 2026-04-23T12:27:32.967Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-23T10:16:17.813

Modified: 2026-06-17T10:44:31.060

Link: CVE-2026-3960

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-19T23:30:05Z

Weaknesses