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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| H2O | H2O | < 3.46.0.10 |
Related Weaknesses (CWE)
References
- https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044Patch
- https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0dExploitThird Party Advisory
FAQ
What is CVE-2026-3960?
CVE-2026-3960 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 secu...
How severe is CVE-2026-3960?
CVE-2026-3960 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-3960?
Check the references section above for vendor advisories and patch information. Affected products include: H2O H2O.