Fixed #33367 -- Fixed URLValidator crash in some edge cases.

django/core/validators.py

@@ -108,15 +108,16 @@ class URLValidator(RegexValidator):
             raise ValidationError(self.message, code=self.code, params={'value': value})
 
         # Then check full URL
+        try:
+            splitted_url = urlsplit(value)
+        except ValueError:
+            raise ValidationError(self.message, code=self.code, params={'value': value})
         try:
             super().__call__(value)
         except ValidationError as e:
             # Trivial case failed. Try for possible IDN domain
             if value:
-                try:
-                    scheme, netloc, path, query, fragment = urlsplit(value)
-                except ValueError:  # for example, "Invalid IPv6 URL"
-                    raise ValidationError(self.message, code=self.code, params={'value': value})
+                scheme, netloc, path, query, fragment = splitted_url
                 try:
                     netloc = punycode(netloc)  # IDN -> ACE
                 except UnicodeError:  # invalid domain part
@@ -127,7 +128,7 @@ class URLValidator(RegexValidator):
                 raise
         else:
             # Now verify IPv6 in the netloc part
-            host_match = re.search(r'^\[(.+)\](?::\d{1,5})?$', urlsplit(value).netloc)
+            host_match = re.search(r'^\[(.+)\](?::\d{1,5})?$', splitted_url.netloc)
             if host_match:
                 potential_ip = host_match[1]
                 try:
@@ -139,7 +140,7 @@ class URLValidator(RegexValidator):
         # section 3.1. It's defined to be 255 bytes or less, but this includes
         # one byte for the length of the name and one byte for the trailing dot
         # that's used to indicate absolute names in DNS.
-        if len(urlsplit(value).hostname) > 253:
+        if splitted_url.hostname is None or len(splitted_url.hostname) > 253:
             raise ValidationError(self.message, code=self.code, params={'value': value})
 
 

tests/forms_tests/field_tests/test_urlfield.py

@@ -100,6 +100,10 @@ class URLFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
             # even on domains that don't fail the domain label length check in
             # the regex.
             'http://%s' % ("X" * 200,),
+            # urlsplit() raises ValueError.
+            '////]@N.AN',
+            # Empty hostname.
+            '#@A.bO',
         ]
         msg = "'Enter a valid URL.'"
         for value in tests: