Double Free in Cassandra

Double Free vulnerabilities in Cassandra occur when memory allocated for a resource is freed more than once, leading to heap corruption, crashes, or potential code execution. In Cassandra's Java-based architecture, this typically manifests through improper reference counting, concurrent access to shared resources, or incorrect cleanup in exception handling paths.

Cassandra's native protocol handling is particularly vulnerable to Double Free issues. When processing CQL queries or handling client connections, Cassandra maintains various buffers and objects that must be carefully managed. A common pattern involves ByteBuffer objects used for query results, where premature deallocation can occur if multiple code paths attempt to release the same buffer.