H2 vulnerability root cause similar to Log4Shell, less exploitation scope Like Log4Shell, the flaw (CVE-2021-42392) relates to Java Naming and Directory Interface (JNDI) remote class loading.

On that point, the JFrog team recommends that all users of the H2 database to upgrade to version 2.0.206, which fixes CVE-2021-42392 by limiting JNDI URLs to use the local java protocol only ...

Write, build, and run an example application that persists data to and from a relational database using Hibernate, JPA, and the repository pattern.

That allows for Java code injection of remote code execution. There are a number of attack vectors that could be used to exploit the vulnerability, the most severe being through the H2 console.