update

Author: lpyu001

Lib/test/test_email/test__header_value_parser.py

@@ -3029,6 +3029,7 @@ def test_parse_message_ids_broken_ang(self):
             )
         self.assertEqual(message_ids.token_type, 'message-id-list')
 
+
 class Test_get_parameter(TestParserMixin, TestEmailBase):
 
     def test_rfc2231_charset_is_retyped_as_attrtext(self):
@@ -3060,6 +3061,7 @@ def test_rfc2231_charset_strips_cfws(self):
         self.assertEqual(param[3][1].token_type, 'cfws')
         self.assertEqual(param.charset, 'us-ascii')
 
+
 @parameterize
 class Test_parse_mime_parameters(TestParserMixin, TestEmailBase):
 

Misc/NEWS.d/next/Library/2026-09-18-23-41-48.gh-issue-150474.uJ3cL-.rst

@@ -1,2 +1,4 @@
-Fix parsing of extended email parameters when CFWS follows the charset,
-preventing the charset value from incorrectly including the trailing CFWS.
+Fix the parsing of the character set of :rfc:`2231` encoded parameters in the
+:mod:`email` header parser.  The character set is now correctly located in
+the parsed value, so whitespace or a comment following it is no longer
+included in the parameter's character set name.