CVE-2026-3960 Details
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.
A critical remote code execution vulnerability has been identified in H2O-3 versions through 3.46.0.9. The issue resides in the unauthenticated REST API endpoint '/99/ImportSQLTable'. The vulnerability stems from inadequate security measures in the parameter blacklist, which only addresses dangerous parameters specific to the MySQL JDBC driver. Attackers can circumvent these controls by changing the JDBC URL protocol to 'jdbc:postgresql:' and exploiting PostgreSQL-specific dangerous parameters like 'socketFactory' and 'socketFactoryArg'. This exploitation enables unauthenticated attackers to execute arbitrary code on the H2O-3 server with the same privileges as the H2O-3 process.
Users can upgrade to H2O-3 version 3.46.0.10 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 23, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044 | [email protected] | Patch |
| https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d | [email protected] | ExploitThird Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| h2o h2o | < 3.46.0.10 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 19, 2026 | Initial Analysis | [email protected] |
| Apr 23, 2026 | New CVE Received | [email protected] |