Apache HertzBeat versions before 1.6.0 use a vulnerable version of the SnakeYAML library to parse YAML files imported through the `/api/monitors/import` and `/api/alert/defines/import` endpoints. An authenticated user can submit a YAML file that constructs an `org.h2.jdbc.JdbcConnection` with a malicious H2 in-memory JDBC URL whose `INIT` block contains a `CREATE ALIAS ... $$ ... $$` Java source snippet, achieving remote code execution inside the HertzBeat JVM. The vulnerability is exploitable in default deployments because the official Docker image and quickstart documentation ship with the well-known default credentials `admin:hertzbeat`, which the template uses for chained authentication.
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