std::string EncodeStorageKey(const std::string& session_tag, int tab_node_id) {
  base::Pickle pickle;
  pickle.WriteString(session_tag);
  pickle.WriteInt(tab_node_id);
  return std::string(static_cast<const char*>(pickle.data()), pickle.size());
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.