--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/regexp/joni/ScanEnvironment.java	2018-06-05 14:15:55.000000000 +0200
+++ new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/regexp/joni/ScanEnvironment.java	2018-06-05 14:15:54.000000000 +0200
@@ -62,6 +62,9 @@
     }
 
     public int addMemEntry() {
+        if (numMem >= Config.MAX_CAPTURE_GROUP_NUM) {
+            throw new InternalException(ErrorMessages.ERR_TOO_MANY_CAPTURE_GROUPS);
+        }
         if (numMem++ == 0) {
             memNodes = new Node[SCANENV_MEMNODES_SIZE];
         } else if (numMem >= memNodes.length) {