External risk intelligence

Apache Gravitino H2 JDBC URL Arbitrary Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-41042

The vulnerability involves an H2 JDBC URL connection typically used for testing and local development purposes. Furthermore, the application is primarily designed and intended for deployment within internal network environments, making public internet exposure uncommon.

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A security flaw in Apache Gravitino, specifically when using the H2 database for testing, allows unauthenticated access to execute arbitrary code on the server. While this vulnerability is rated critical, its impact is considered low because H2 is primarily for testing and local development, and Gravitino is typically deployed internally.

Code execution via H2 test connections.
Low internal impact, check for H2 testing use.
Confirm relevance, assess exposure if testing internally.

Attack Path

How an attacker could exploit the issue

Attackers can send a specially crafted H2 JDBC URL to the `testConnection` API. This allows them to execute arbitrary Java code on the server, assuming the application is configured to use H2 for its connection testing.

Unauthenticated callers can send a malicious request.
The `testConnection` API processes a malformed JDBC URL.
Arbitrary Java code execution on the server.

Live Threat

Current exploitation, exposure, and threat context

When the H2 database is used for testing or local development, unauthenticated callers could supply a malicious H2 JDBC URL to the testConnection API. This could lead to arbitrary Java code execution on the server.

Arbitrary Java code execution.
Unauthenticated H2 JDBC URL supply.
Server compromise and data exposure.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Apache Gravitino team or the application owner is likely responsible for addressing this vulnerability, especially given its use of H2 for testing and local development, and its typical internal deployment. The first practical step is to confirm if the affected test functionality is exposed externally or used in a critical internal capacity, identify the specific instance and its owner, and then plan remediation by upgrading.

Application or Platform Owner
Verify H2 test connection exposure.
Upgrade Gravitino or restrict H2 usage.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Apache Gravitino?

Apache Gravitino is a metadata lakehouse platform designed for managing and cataloging data assets across heterogeneous storage systems. It provides a unified layer for handling data, schemas, and security policies. While it supports various database connectors, including H2 for local development and testing, its primary function is to simplify the management of complex data pipelines within an organization.

How is the vulnerability in CVE-2026-41042 classified?

This vulnerability is classified as CWE-20, which stands for Improper Input Validation. The application fails to adequately sanitize or verify JDBC connection strings provided through the testConnection API. This flaw allows unauthorized inputs to bypass security checks, potentially enabling the execution of arbitrary code during the connection process.

How can an attacker trigger this vulnerability?

An attacker can exploit this by submitting a crafted H2 JDBC URL to the testConnection API. The vulnerability is specifically triggered when the system processes the INIT parameter within the malicious URL. This path does not apply when alternative databases are used, as the risk is strictly tied to the H2 database engine's specific features used during testing configurations.

Is this vulnerability relevant to my environment?

The risk is generally low, as noted by the Halo Surface Signal, which labels this as 'Unlikely.' The H2 database is primarily used for testing and local development rather than production workloads. Additionally, since Apache Gravitino is typically deployed within protected internal network environments, the likelihood of public internet exposure is minimal.

What steps should be taken to address this issue?

To remediate, prioritize upgrading to Apache Gravitino version 1.2.1, which includes the necessary security fixes. Before upgrading, identify if any Gravitino instances are configured to use H2 and assess whether these testing endpoints are accessible from untrusted networks. Restricting access to test-related APIs or migrating away from H2 in non-development environments is recommended.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.