diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index d2da0f8..7813b9f 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -872,6 +872,17 @@ class URLopener_Tests(unittest.TestCase):
             "spam://c:|windows%/:=&?~#+!$,;'@()*[]|/path/"),
             "//c:|windows%/:=&?~#+!$,;'@()*[]|/path/")
 
+    def test_local_file_open(self):
+        # bpo-35907, CVE-2019-9948: urllib must reject local_file:// scheme
+        class DummyURLopener(urllib.URLopener):
+            def open_local_file(self, url):
+                return url
+        for url in ('local_file://example', 'local-file://example'):
+            self.assertRaises(IOError, urllib.urlopen, url)
+            self.assertRaises(IOError, urllib.URLopener().open, url)
+            self.assertRaises(IOError, urllib.URLopener().retrieve, url)
+            self.assertRaises(IOError, DummyURLopener().open, url)
+            self.assertRaises(IOError, DummyURLopener().retrieve, url)
 
 # Just commented them out.
 # Can't really tell why keep failing in windows and sparc.
diff --git a/Lib/urllib.py b/Lib/urllib.py
index 2201e3e..71e3637 100644
--- a/Lib/urllib.py
+++ b/Lib/urllib.py
@@ -198,7 +198,9 @@ class URLopener:
         name = 'open_' + urltype
         self.type = urltype
         name = name.replace('-', '_')
-        if not hasattr(self, name):
+
+        # bpo-35907: disallow the file reading with the type not allowed
+        if not hasattr(self, name) or name == 'open_local_file':
             if proxy:
                 return self.open_unknown_proxy(proxy, fullurl, data)
             else: