diff --git a/src/builtins/builtins-collections-gen.cc b/src/builtins/builtins-collections-gen.cc
index 00cad7b..d590ffd 100644
--- a/src/builtins/builtins-collections-gen.cc
+++ b/src/builtins/builtins-collections-gen.cc
@@ -1762,6 +1762,9 @@
   ThrowIfNotInstanceType(context, receiver, JS_MAP_TYPE,
                          "Map.prototype.delete");
 
+  // This check breaks a known exploitation technique. See crbug.com/1263462
+  CSA_CHECK(this, TaggedNotEqual(key, TheHoleConstant()));
+
   const TNode<OrderedHashMap> table =
       LoadObjectField<OrderedHashMap>(CAST(receiver), JSMap::kTableOffset);
 
@@ -1930,6 +1933,9 @@
   ThrowIfNotInstanceType(context, receiver, JS_SET_TYPE,
                          "Set.prototype.delete");
 
+  // This check breaks a known exploitation technique. See crbug.com/1263462
+  CSA_CHECK(this, TaggedNotEqual(key, TheHoleConstant()));
+
   const TNode<OrderedHashSet> table =
       LoadObjectField<OrderedHashSet>(CAST(receiver), JSMap::kTableOffset);
 
@@ -2878,6 +2884,9 @@
   ThrowIfNotInstanceType(context, receiver, JS_WEAK_MAP_TYPE,
                          "WeakMap.prototype.delete");
 
+  // This check breaks a known exploitation technique. See crbug.com/1263462
+  CSA_CHECK(this, TaggedNotEqual(key, TheHoleConstant()));
+
   Return(CallBuiltin(Builtin::kWeakCollectionDelete, context, receiver, key));
 }
 
@@ -2926,6 +2935,9 @@
   ThrowIfNotInstanceType(context, receiver, JS_WEAK_SET_TYPE,
                          "WeakSet.prototype.delete");
 
+  // This check breaks a known exploitation technique. See crbug.com/1263462
+  CSA_CHECK(this, TaggedNotEqual(value, TheHoleConstant()));
+
   Return(CallBuiltin(Builtin::kWeakCollectionDelete, context, receiver, value));
 }