Vulnerability · Published Apr 23, 2026 · Assigned by @huntr_ai
CVE-2026-3960Remote Code Execution in h2oai/h2o-3
Medium 5.9
In plain English
A medium-severity code injection in h2oai/h2o-3 from h2oai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | ai.h2o:h2o-core | 3.46.0.10 | GHSA-qmcv-hh7c-3m56 |
| PyPI | h2o | 3.46.0.10 | PYSEC-2026-2180 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| h2oai | h2oai/h2o-3 | unspecified – before 3.46.0.10 |
Weakness: CWE-94 · Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H