diff --git ChangeLog.d/bugfix/ZBX-19715 ChangeLog.d/bugfix/ZBX-19715
new file mode 100644
index 0000000..f01d61c
--- /dev/null
+++ ChangeLog.d/bugfix/ZBX-19715
@@ -0,0 +1 @@
+........S. [ZBX-19715] fixed high memory usage in trappers and proxy pollers when sending configuration to Zabbix proxy (vso)
diff --git include/zbxjson.h include/zbxjson.h
index 81fa808..e36e348 100644
--- include/zbxjson.h
+++ include/zbxjson.h
@@ -256,6 +256,7 @@ const char	*zbx_json_strerror(void);
 void	zbx_json_init(struct zbx_json *j, size_t allocate);
 void	zbx_json_initarray(struct zbx_json *j, size_t allocate);
 void	zbx_json_clean(struct zbx_json *j);
+void	zbx_json_cleanarray(struct zbx_json *j);
 void	zbx_json_free(struct zbx_json *j);
 void	zbx_json_addobject(struct zbx_json *j, const char *name);
 void	zbx_json_addarray(struct zbx_json *j, const char *name);
diff --git src/libs/zbxdbhigh/proxy.c src/libs/zbxdbhigh/proxy.c
index 4db2d42..b05aee1 100644
--- src/libs/zbxdbhigh/proxy.c
+++ src/libs/zbxdbhigh/proxy.c
@@ -478,7 +478,7 @@ typedef struct
 {
 	zbx_uint64_t	itemid;
 	zbx_uint64_t	master_itemid;
-	struct zbx_json	data;
+	char		*buffer;
 }
 zbx_proxy_item_config_t;
 
@@ -498,10 +498,10 @@ static int	get_proxyconfig_table_items(zbx_uint64_t proxy_hostid, struct zbx_jso
 	DB_RESULT		result;
 	DB_ROW			row;
 	zbx_hashset_t		proxy_items;
-	struct zbx_json		*jrow;
 	zbx_vector_ptr_t	items;
 	zbx_uint64_t		itemid;
 	zbx_hashset_iter_t	iter;
+	struct zbx_json		json_array;
 
 	zabbix_log(LOG_LEVEL_DEBUG, "In %s() proxy_hostid:" ZBX_FS_UI64, __func__, proxy_hostid);
 
@@ -566,6 +566,7 @@ static int	get_proxyconfig_table_items(zbx_uint64_t proxy_hostid, struct zbx_jso
 	}
 
 	zbx_hashset_create(&proxy_items, 1000, ZBX_DEFAULT_UINT64_HASH_FUNC, ZBX_DEFAULT_UINT64_COMPARE_FUNC);
+	zbx_json_initarray(&json_array, 256);
 
 	while (NULL != (row = DBfetch(result)))
 	{
@@ -579,20 +580,26 @@ static int	get_proxyconfig_table_items(zbx_uint64_t proxy_hostid, struct zbx_jso
 			ZBX_STR2UINT64(proxy_item_local.itemid, row[0]);
 			ZBX_STR2UINT64(proxy_item_local.master_itemid, row[fld_master]);
 			proxy_item = zbx_hashset_insert(&proxy_items, &proxy_item_local, sizeof(proxy_item_local));
-			zbx_json_initarray(&proxy_item->data, 256);
-			jrow = &proxy_item->data;
+
+			proxyconfig_add_row(&json_array, row, table);
+
+			proxy_item->buffer = zbx_malloc(NULL, json_array.buffer_size + 1);
+			memcpy(proxy_item->buffer, json_array.buffer, json_array.buffer_size + 1);
+
+			zbx_json_cleanarray(&json_array);
 		}
 		else
 		{
 			ZBX_STR2UINT64(itemid, row[0]);
 			zbx_hashset_insert(itemids, &itemid, sizeof(itemid));
+
 			zbx_json_addarray(j, NULL);
-			jrow = j;
+			proxyconfig_add_row(j, row, table);
+			zbx_json_close(j);
 		}
-
-		proxyconfig_add_row(jrow, row, table);
-		zbx_json_close(jrow);
 	}
+	DBfree_result(result);
+	zbx_json_free(&json_array);
 
 	/* flush cached dependent items */
 
@@ -622,9 +629,9 @@ static int	get_proxyconfig_table_items(zbx_uint64_t proxy_hostid, struct zbx_jso
 			if (NULL != zbx_hashset_search(itemids, &proxy_item->master_itemid))
 			{
 				zbx_hashset_insert(itemids, &proxy_item->itemid, sizeof(itemid));
-				zbx_json_addraw(j, NULL, proxy_item->data.buffer);
+				zbx_json_addraw(j, NULL, proxy_item->buffer);
 			}
-			zbx_json_free(&proxy_item->data);
+			zbx_free(proxy_item->buffer);
 			zbx_hashset_remove_direct(&proxy_items, proxy_item);
 		}
 
@@ -632,9 +639,6 @@ static int	get_proxyconfig_table_items(zbx_uint64_t proxy_hostid, struct zbx_jso
 	}
 	zbx_vector_ptr_destroy(&items);
 	zbx_hashset_destroy(&proxy_items);
-
-	DBfree_result(result);
-
 skip_data:
 	zbx_free(sql);
 
diff --git src/libs/zbxjson/json.c src/libs/zbxjson/json.c
index b2415a1..029bbfb 100644
--- src/libs/zbxjson/json.c
+++ src/libs/zbxjson/json.c
@@ -134,16 +134,24 @@ void	zbx_json_initarray(struct zbx_json *j, size_t allocate)
 	zbx_json_addarray(j, NULL);
 }
 
-void	zbx_json_clean(struct zbx_json *j)
+static void	zbx_json_setempty(struct zbx_json *j)
 {
-	assert(j);
-
 	j->buffer_offset = 0;
 	j->buffer_size = 0;
 	j->status = ZBX_JSON_EMPTY;
 	j->level = 0;
 	*j->buffer = '\0';
+}
+
+void	zbx_json_cleanarray(struct zbx_json *j)
+{
+	zbx_json_setempty(j);
+	zbx_json_addarray(j, NULL);
+}
 
+void	zbx_json_clean(struct zbx_json *j)
+{
+	zbx_json_setempty(j);
 	zbx_json_addobject(j, NULL);
 }
 
diff --git src/zabbix_server/proxypoller/proxypoller.c src/zabbix_server/proxypoller/proxypoller.c
index 128136b..d4907ce 100644
--- src/zabbix_server/proxypoller/proxypoller.c
+++ src/zabbix_server/proxypoller/proxypoller.c
@@ -254,6 +254,8 @@ static int	proxy_send_configuration(DC_PROXY *proxy)
 
 	if (SUCCEED == (ret = send_data_to_proxy(proxy, &s, j.buffer, j.buffer_size)))
 	{
+		zbx_json_free(&j);	/* json buffer can be large, free as fast as possible */
+
 		if (SUCCEED != (ret = zbx_recv_response(&s, 0, &error)))
 		{
 			zabbix_log(LOG_LEVEL_WARNING, "cannot send configuration data to proxy"