diff -r a5acd7ca8727 Lib/test/test_super.py
--- a/Lib/test/test_super.py	Tue Apr 12 07:52:22 2016 +0200
+++ b/Lib/test/test_super.py	Tue Apr 12 21:45:42 2016 +0300
@@ -171,6 +171,15 @@ class TestSuper(unittest.TestCase):
         c = f().__closure__[0]
         self.assertRaises(TypeError, X.meth, c)
 
+    def test_super_init_leaks(self):
+        # Issue #26718: super.__init__ leaked memory if called multiple times.
+        # This will be caught by regrtest.py -R if this leak.
+        # NOTE: Despite the use in the test a direct call of super.__init__
+        # is not endorsed.
+        sp = super(float, 1.0)
+        for i in range(1000):
+            super.__init__(sp, int, i)
+
 
 if __name__ == "__main__":
     unittest.main()
diff -r a5acd7ca8727 Objects/typeobject.c
--- a/Objects/typeobject.c	Tue Apr 12 07:52:22 2016 +0200
+++ b/Objects/typeobject.c	Tue Apr 12 21:45:42 2016 +0300
@@ -7350,9 +7350,9 @@ super_init(PyObject *self, PyObject *arg
         Py_INCREF(obj);
     }
     Py_INCREF(type);
-    su->type = type;
-    su->obj = obj;
-    su->obj_type = obj_type;
+    Py_XSETREF(su->type, type);
+    Py_XSETREF(su->obj, obj);
+    Py_XSETREF(su->obj_type, obj_type);
     return 0;
 }