Index: tests/Zend/Form/Element/CaptchaTest.php
===================================================================
--- tests/Zend/Form/Element/CaptchaTest.php     (revision 15725)
+++ tests/Zend/Form/Element/CaptchaTest.php     (working copy)
@@ -153,6 +153,15 @@
         $this->assertTrue(array_key_exists('Zend_Form_Decorator_HtmlTag', $decorators), 'Missing HtmlTag decorator' . var_export(array_keys($decorators), 1));
         $this->assertTrue(array_key_exists('Zend_Form_Decorator_Label', $decorators), 'Missing Label decorator' . var_export(array_keys($decorators), 1));
     }
+
+    /**
+     * @group ZF-5855
+     */
+    public function testHelperDoesNotShowUpInAttribs()
+    {
+        require_once 'Zend/View.php';
+        $this->assertFalse(array_key_exists('helper', $this->element->getAttribs()));
+    }
 }

 class Zend_Form_Element_CaptchaTest_SessionContainer
Index: library/Zend/Form/Element/Captcha.php
===================================================================
--- library/Zend/Form/Element/Captcha.php       (revision 15725)
+++ library/Zend/Form/Element/Captcha.php       (working copy)
@@ -53,6 +53,25 @@
      * @var Zend_Captcha_Adapter
      */
     protected $_captcha;
+
+    /**
+     * Return all attributes
+     *
+     * @return array
+     */
+    public function getAttribs()
+    {
+        $attribs = get_object_vars($this);
+        unset($attribs['helper']);
+        foreach ($attribs as $key => $value) {
+            if ('_' == substr($key, 0, 1)) {
+                unset($attribs[$key]);
+            }
+        }
+
+        return $attribs;
+    }
+

     /**
      * Get captcha adapter