Index: Lib/urllib/parse.py
===================================================================
--- Lib/urllib/parse.py	(revision 70667)
+++ Lib/urllib/parse.py	(working copy)
@@ -645,7 +645,7 @@
     global _passwdprog
     if _passwdprog is None:
         import re
-        _passwdprog = re.compile('^([^:]*):(.*)$')
+        _passwdprog = re.compile('^([^:]*):(.*)$',re.S)
 
     match = _passwdprog.match(user)
     if match: return match.group(1, 2)
Index: Lib/test/test_urllib.py
===================================================================
--- Lib/test/test_urllib.py	(revision 70667)
+++ Lib/test/test_urllib.py	(working copy)
@@ -830,6 +830,21 @@
                          "url2pathname() failed; %s != %s" %
                          (expect, result))
 
+class Utility_Tests(unittest.TestCase):
+    """Testcase to test the various utility functions in the urllib."""
+
+    def test_splitpasswd(self):
+        """Some of password examples are not sensible, but it is added to
+        confirming to RFC2617 and addressing issue4675.
+        """
+        self.assertEqual(('user', 'ab'),urllib.parse.splitpasswd('user:ab'))
+        self.assertEqual(('user', 'a\nb'),urllib.parse.splitpasswd('user:a\nb'))
+        self.assertEqual(('user', 'a\tb'),urllib.parse.splitpasswd('user:a\tb'))
+        self.assertEqual(('user', 'a\rb'),urllib.parse.splitpasswd('user:a\rb'))
+        self.assertEqual(('user', 'a\fb'),urllib.parse.splitpasswd('user:a\fb'))
+        self.assertEqual(('user', 'a\vb'),urllib.parse.splitpasswd('user:a\vb'))
+        self.assertEqual(('user', 'a:b'),urllib.parse.splitpasswd('user:a:b'))
+
 # Just commented them out.
 # Can't really tell why keep failing in windows and sparc.
 # Everywhere else they work ok, but on those machines, someteimes
@@ -920,6 +935,7 @@
         UnquotingTests,
         urlencode_Tests,
         Pathname_Tests,
+        Utility_Tests,
         #FTPWrapperTests,
     )