CVE-2026-3960
CriticalCVSS 9.8Exploitation Probability (EPSS)
Elevated risk61th percentile - higher than 61% of all known CVEs
Summary
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, allowing attackers to bypass these controls.
Risk Assessment
Attackers can remotely execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process, posing a serious security threat to the organization.
Recommendation
It is recommended to upgrade to version 3.46.0.10 to mitigate this vulnerability and implement additional security measures in the API.
Other vulnerabilities in H2O-3
See all- CVE-2026-8750Medium
In h2oai h2o-3 up to 7402, the importFiles function in PersistNFS.java (ImportFile API component) leads to information disclosure. The attack can be executed remotely, and a public exploit is available.
- CVE-2025-10768Medium
A vulnerability was found in h2oai h2o-3 up to version 3.46.08. The impacted element is an unknown function of the /99/ImportSQLTable file related to the IBMDB2 JDBC Driver component. Manipulation of the connection_url argument causes deserialization, and the attack can be initiated remotely. The exploit has been publicly disclosed and may be used.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS