diff -r 9e61563edb67 Lib/cgi.py
--- a/Lib/cgi.py	Sun Aug 11 16:48:44 2013 -0700
+++ b/Lib/cgi.py	Mon Aug 12 19:19:28 2013 +0800
@@ -587,6 +587,10 @@
         else:
             return found
 
+    def __del__(self):
+        if self.file:
+            self.file.close()
+
     def getvalue(self, key, default=None):
         """Dictionary style get() method, including 'value' lookup."""
         if key in self: