diff --git a/src/share/classes/com/sun/jmx/snmp/SnmpString.java b/src/share/classes/com/sun/jmx/snmp/SnmpString.java
index 9ec7f7cd5206a38526fa1e88026e930b2214cfe8..76af600386ae1dc66798999e820adc602d228bd3 100644
--- a/src/share/classes/com/sun/jmx/snmp/SnmpString.java
+++ b/src/share/classes/com/sun/jmx/snmp/SnmpString.java
@@ -130,7 +130,7 @@ public class SnmpString extends SnmpValue {
      * @return The value.
      */
     public byte[] byteValue() {
-        return value ;
+        return value.clone() ;
     }
 
     /**
diff --git a/src/share/classes/com/sun/jmx/snmp/agent/SnmpMib.java b/src/share/classes/com/sun/jmx/snmp/agent/SnmpMib.java
index df7587404ef283564e2730fe3865a3d0120911e1..ac9c4bbd54fdfbc23395c238359c72d691b2988b 100644
--- a/src/share/classes/com/sun/jmx/snmp/agent/SnmpMib.java
+++ b/src/share/classes/com/sun/jmx/snmp/agent/SnmpMib.java
@@ -476,8 +476,7 @@ public abstract class SnmpMib extends SnmpMibAgent implements Serializable {
                 rootOid[i++]= val.longValue();
             }
         }
-        return rootOid;
-
+        return rootOid.clone();
     }
 
     // --------------------------------------------------------------------
diff --git a/src/share/classes/com/sun/jmx/snmp/daemon/CommunicatorServer.java b/src/share/classes/com/sun/jmx/snmp/daemon/CommunicatorServer.java
index b2634d8eee1ed281e89c94c3a37411f04c6b3364..b0828e21be97562d78fd69b6508dc0b674c30cd8 100644
--- a/src/share/classes/com/sun/jmx/snmp/daemon/CommunicatorServer.java
+++ b/src/share/classes/com/sun/jmx/snmp/daemon/CommunicatorServer.java
@@ -1248,7 +1248,7 @@ public abstract class CommunicatorServer
                      "of this CommunicatorServer instance has changed.");
         }
 
-        return notifInfos;
+        return notifInfos.clone();
     }
 
     /**
diff --git a/test/com/sun/jmx/snmp/NoInfoLeakTest.java b/test/com/sun/jmx/snmp/NoInfoLeakTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..dcf54416a08d47b1f5c5cd4b4311f32a41b3e80a
--- /dev/null
+++ b/test/com/sun/jmx/snmp/NoInfoLeakTest.java
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test
+ * @bug 8026028
+ * @summary Tests no leak of internal info
+ * @author Shanliang JIANG
+ * @run clean NoInfoLeakTest
+ * @run build NoInfoLeakTest
+ * @run main NoInfoLeakTest
+ */
+
+import com.sun.jmx.snmp.SnmpString;
+import com.sun.jmx.snmp.agent.SnmpMib;
+import com.sun.jmx.snmp.agent.SnmpMibTable;
+import com.sun.jmx.snmp.daemon.CommunicatorServer;
+import com.sun.jmx.snmp.daemon.SnmpAdaptorServer;
+import javax.management.MBeanNotificationInfo;
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
+
+public class NoInfoLeakTest {
+    public static void main(String[] args) throws Exception {
+        boolean ok = true;
+        ok &= snmpStringTest();
+        ok &= snmpMibTest();
+        ok &= communicatorServerTest();
+
+        if (!ok) {
+            throw new RuntimeException("Some tests are failed!");
+        }
+    }
+
+    private static boolean snmpStringTest() {
+        System.out.println("\n---NoInfoLeakTest-snmpStringTest: testing the method byteValue()...");
+        boolean passed = true;
+
+        byte[] mine = new byte[]{1,1,1,};
+        SnmpString ss = new SnmpString(mine);
+        byte[] got = ss.byteValue();
+        got[0]=0;
+
+        if (ss.byteValue()[0] == 0) {
+            System.err.println("Failed: SnmpString.byteValue() returns an internal mutable object value");
+            passed = false;
+        } else {
+            System.out.println("---NoInfoLeakTest-snmpStringTest done.");
+        }
+        return passed;
+    }
+
+    private static boolean snmpMibTest() {
+        boolean passed = true;
+        System.out.println("\n---NoInfoLeakTest-snmpMibTest: testing the method "
+                + "SnmpMib.getRootOid()...");
+        SnmpMib mib = new MySnmpMib();
+
+        if (mib.getRootOid() == mib.getRootOid()) {
+            System.err.println("Failed: SnmpMib.getRootOid() returns an internal"
+                    + " mutable object value "+mib.getRootOid());
+        } else {
+            System.out.println("---NoInfoLeakTest-snmpMibTest done.");
+        }
+        return passed;
+    }
+
+    private static boolean communicatorServerTest() {
+        boolean passed = true;
+        System.out.println("\n---NoInfoLeakTest-communicatorServerTest: testing the method CommunicatorServer.getNotificationInfo()...");
+        CommunicatorServer server = new SnmpAdaptorServer();
+        MBeanNotificationInfo[] notifs = server.getNotificationInfo();
+
+        assert notifs.length > 0 && notifs[0] != null; // the current implementation ensures this
+        notifs[0] = null;
+        if (server.getNotificationInfo()[0] == null) {
+            System.err.println("Failed: CommunicatorServer.getNotificationInfo()"
+                    + " returns an internal mutable object value");
+            passed = false;
+        } else {
+            System.out.println("---NoInfoLeakTest-communicatorServerTest done.");
+        }
+        return passed;
+    }
+
+    private static class MySnmpMib extends SnmpMib {
+        @Override
+        public void registerTableMeta(String name, SnmpMibTable table) {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+
+        @Override
+        public SnmpMibTable getRegisteredTableMeta(String name) {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+
+        @Override
+        public void init() throws IllegalAccessException {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+
+        @Override
+        public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+    }
+}