# UNDF: UNDF-2026-000000960
--- a/cocos/base/CCEventDispatcher.h
+++ b/cocos/base/CCEventDispatcher.h
@@ -29,6 +29,7 @@
 #include <string>
 #include <unordered_map>
+#include <unordered_set>
 #include <vector>
 #include <set>

@@ -335,7 +336,7 @@
     std::vector<EventListener*> _toAddedListeners;

     /** The listeners to be removed after dispatching event */
-    std::vector<EventListener*> _toRemovedListeners;
+    std::unordered_set<EventListener*> _toRemovedListeners;

     /** The nodes were associated with scene graph based priority listeners */
     std::set<Node*> _dirtyNodes;
--- a/cocos/base/CCEventDispatcher.cpp
+++ b/cocos/base/CCEventDispatcher.cpp
@@ -607,8 +607,7 @@ void EventDispatcher::removeEventListener(EventListener* listener)
         return;

     // just return if listener is in _toRemovedListeners to avoid remove listeners more than once
-    if (std::find(_toRemovedListeners.begin(), _toRemovedListeners.end(), listener) != _toRemovedListeners.end())
+    if (_toRemovedListeners.count(listener) > 0)
         return;

     bool isFound = false;
@@ -636,7 +635,7 @@ void EventDispatcher::removeEventListener(EventListener* listener)
                 }
                 else
                 {
-                    _toRemovedListeners.push_back(l);
+                    _toRemovedListeners.insert(l);
                 }

                 isFound = true;
@@ -1171,9 +1170,8 @@ void EventDispatcher::updateListeners(Event* event)
                 {
                     iter = sceneGraphPriorityListeners->erase(iter);
                     // if item in toRemove list, remove it from the list
-                    auto matchIter = std::find(_toRemovedListeners.begin(), _toRemovedListeners.end(), l);
-                    if (matchIter != _toRemovedListeners.end())
-                        _toRemovedListeners.erase(matchIter);
+                    if (_toRemovedListeners.count(l) > 0)
+                        _toRemovedListeners.erase(l);
                     releaseListener(l);
                 }
                 else
@@ -1192,9 +1190,8 @@ void EventDispatcher::updateListeners(Event* event)
                 {
                     iter = fixedPriorityListeners->erase(iter);
                     // if item in toRemove list, remove it from the list
-                    auto matchIter = std::find(_toRemovedListeners.begin(), _toRemovedListeners.end(), l);
-                    if (matchIter != _toRemovedListeners.end())
-                        _toRemovedListeners.erase(matchIter);
+                    if (_toRemovedListeners.count(l) > 0)
+                        _toRemovedListeners.erase(l);
                     releaseListener(l);
                 }
                 else
@@ -1560,7 +1557,7 @@ void EventDispatcher::cleanToRemovedListeners()
 {
     for (auto& l : _toRemovedListeners)
     {
-        auto listenersIter = _listenerMap.find(l->getListenerID());
+        auto listenersIter = _listenerMap.find(l->getListenerID());
         if (listenersIter == _listenerMap.end())
         {
             releaseListener(l);