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CVE-2026-3960— Remote Code Execution in h2oai/h2o-3

Quick assessment

Affected
h2oai h2oai/h2o-3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

H2O是H2O.ai开源的一个用于分布式、可扩展机器学习的内存平台。 H2O 3.46.0.9及之前版本存在代码注入漏洞，该漏洞源于参数黑名单机制安全控制不足，攻击者可通过切换JDBC URL协议并利用PostgreSQL JDBC驱动特定参数绕过控制，可能导致未经身份验证的攻击者执行任意代码。

AI Predicted 9.8 Difficulty: Easy EPSS 1.03% · P63
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I. Basic Information for CVE-2026-3960

Vulnerability Information
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Vulnerability Title
Remote Code Execution in h2oai/h2o-3
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
H2O 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
H2O是H2O.ai开源的一个用于分布式、可扩展机器学习的内存平台。 H2O 3.46.0.9及之前版本存在代码注入漏洞，该漏洞源于参数黑名单机制安全控制不足，攻击者可通过切换JDBC URL协议并利用PostgreSQL JDBC驱动特定参数绕过控制，可能导致未经身份验证的攻击者执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
h2oai h2oai/h2o-3 unspecified ~ 3.46.0.10 -

II. Public POCs for CVE-2026-3960

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III. Intelligence Information for CVE-2026-3960

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Patches & Fixes for CVE-2026-3960 (1)

Vendor Advisories for CVE-2026-3960 (1)

IV. Related Vulnerabilities

Same product: h2oai/h2o-3
Same vendor: h2oai
Same weakness: CWE-94

V. Comments for CVE-2026-3960

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