diff --git a/NEWS b/NEWS
index c6c3af84b7aed..a81584080987b 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,8 @@ PHP                                                                        NEWS
     (Dmitry)
   . Fixed bug #76800 (foreach inconsistent if array modified during loop).
     (Dmitry)
+  . Fixed bug #76901 (method_exists on SPL iterator passthrough method corrupts
+    memory). (Nikita)
 
 - Standard:
   . Fixed bug #75533 (array_reduce is slow when $carry is large array).
diff --git a/Zend/tests/bug76901.phpt b/Zend/tests/bug76901.phpt
new file mode 100644
index 0000000000000..8d567d9e0cbe1
--- /dev/null
+++ b/Zend/tests/bug76901.phpt
@@ -0,0 +1,18 @@
+--TEST--
+Bug #76901: method_exists on SPL iterator passthrough method corrupts memory
+--FILE--
+<?php
+
+$it = new ArrayIterator([1, 2, 3]);
+$it = new IteratorIterator($it);
+foreach ($it as $v) {
+    if (method_exists($it, 'offsetGet')) {
+        var_dump($it->offsetGet(0));
+    }
+}
+
+?>
+--EXPECT--
+int(1)
+int(1)
+int(1)
diff --git a/Zend/zend_builtin_functions.c b/Zend/zend_builtin_functions.c
index 4989b4b5b5324..96d5127711eda 100644
--- a/Zend/zend_builtin_functions.c
+++ b/Zend/zend_builtin_functions.c
@@ -1347,13 +1347,10 @@ ZEND_FUNCTION(method_exists)
 	if (zend_hash_exists(&ce->function_table, lcname)) {
 		zend_string_release_ex(lcname, 0);
 		RETURN_TRUE;
-	} else {
-		union _zend_function *func = NULL;
-
-		if (Z_TYPE_P(klass) == IS_OBJECT
-		&& Z_OBJ_HT_P(klass)->get_method != NULL
-		&& (func = Z_OBJ_HT_P(klass)->get_method(&Z_OBJ_P(klass), method_name, NULL)) != NULL
-		) {
+	} else if (Z_TYPE_P(klass) == IS_OBJECT && Z_OBJ_HT_P(klass)->get_method != NULL) {
+		zend_object *obj = Z_OBJ_P(klass);
+		zend_function *func = Z_OBJ_HT_P(klass)->get_method(&obj, method_name, NULL);
+		if (func != NULL) {
 			if (func->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE) {
 				/* Returns true to the fake Closure's __invoke */
 				RETVAL_BOOL(func->common.scope == zend_ce_closure