diff --git a/Zend/zend_execute_API.c b/Zend/zend_execute_API.c
index 71e0c56a51c8..cb48e6234371 100644
--- a/Zend/zend_execute_API.c
+++ b/Zend/zend_execute_API.c
@@ -861,6 +861,14 @@ zend_result zend_call_function(zend_fcall_info *fci, zend_fcall_info_cache *fci_
 		}
 	}
 
+#ifdef ZEND_CHECK_STACK_LIMIT
+	if (UNEXPECTED(zend_call_stack_overflowed(EG(stack_limit)))) {
+		zend_call_stack_size_error();
+		zend_release_fcall_info_cache(fci_cache);
+		return SUCCESS;
+	}
+#endif
+
 	call = zend_vm_stack_push_call_frame(call_info,
 		func, fci->param_count, object_or_called_scope);
 	uint32_t consumed_args = fci->param_count ? fci->consumed_args : 0;
diff --git a/ext/spl/tests/gh15672.phpt b/ext/spl/tests/gh15672.phpt
new file mode 100644
index 000000000000..ff3feda46f7e
--- /dev/null
+++ b/ext/spl/tests/gh15672.phpt
@@ -0,0 +1,22 @@
+--TEST--
+GH-15672 (MultipleIterator attached to itself overflows the C stack)
+--SKIPIF--
+<?php
+if (!function_exists('zend_test_zend_call_stack_get')) die("skip zend_test_zend_call_stack_get() is not available");
+if (getenv("SKIP_SLOW_TESTS")) die('skip slow test');
+?>
+--EXTENSIONS--
+zend_test
+--INI--
+memory_limit=2G
+zend.max_allowed_stack_size=512K
+--FILE--
+<?php
+$m = new MultipleIterator();
+$m->attachIterator(new ArrayIterator([1, 2, 3]), "1");
+$m->attachIterator($m, 3);
+foreach ($m as $key => $value) {
+}
+?>
+--EXPECTREGEX--
+.*Maximum call stack size of \d+ bytes.*Infinite recursion\?.*thrown in .* on line \d+
diff --git a/ext/spl/tests/gh15911.phpt b/ext/spl/tests/gh15911.phpt
new file mode 100644
index 000000000000..502b2baf616b
--- /dev/null
+++ b/ext/spl/tests/gh15911.phpt
@@ -0,0 +1,21 @@
+--TEST--
+GH-15911 (AppendIterator appended to itself overflows the C stack)
+--SKIPIF--
+<?php
+if (!function_exists('zend_test_zend_call_stack_get')) die("skip zend_test_zend_call_stack_get() is not available");
+if (getenv("SKIP_SLOW_TESTS")) die('skip slow test');
+?>
+--EXTENSIONS--
+zend_test
+--INI--
+memory_limit=2G
+zend.max_allowed_stack_size=512K
+--FILE--
+<?php
+$it = new AppendIterator();
+$it->append($it);
+foreach ($it as $v) {
+}
+?>
+--EXPECTREGEX--
+.*Maximum call stack size of \d+ bytes.*Infinite recursion\?.*thrown in .* on line \d+