bpo-38332: Catch KeyError from unknown cte in encoded-word. (GH-16503)

KeyError should cause a failure in parsing the encoded word and should be caught and raised as a _InvalidEWError instead.
(cherry picked from commit 65dcc8a8dc41d3453fd6b987073a5f1b30c5c0fd)

Co-authored-by: Andrei Troie <andreitroie90@gmail.com>

4 files changed, 18 insertions, 1 deletions

diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
index 7cc9a46..3197d49 100644
--- a/Lib/email/_header_value_parser.py
+++ b/Lib/email/_header_value_parser.py
@@ -1055,7 +1055,7 @@ def get_encoded_word(value):
     value = ''.join(remainder)
     try:
         text, charset, lang, defects = _ew.decode('=?' + tok + '?=')
-    except ValueError:
+    except (ValueError, KeyError):
         raise _InvalidEwError(
             "encoded word format invalid: '{}'".format(ew.cte))
     ew.charset = charset
diff --git a/Lib/test/test_email/test__encoded_words.py b/Lib/test/test_email/test__encoded_words.py
index 5a59aeb..0b8b1de 100644
--- a/Lib/test/test_email/test__encoded_words.py
+++ b/Lib/test/test_email/test__encoded_words.py
@@ -58,6 +58,8 @@ class TestDecode(TestEmailBase):
             _ew.decode('=?')
         with self.assertRaises(ValueError):
             _ew.decode('')
+        with self.assertRaises(KeyError):
+            _ew.decode('=?utf-8?X?somevalue?=')
 
     def _test(self, source, result, charset='us-ascii', lang='', defects=[]):
         res, char, l, d = _ew.decode(source)
diff --git a/Lib/test/test_email/test__header_value_parser.py b/Lib/test/test_email/test__header_value_parser.py
index 8bb0365..4894d8f 100644
--- a/Lib/test/test_email/test__header_value_parser.py
+++ b/Lib/test/test_email/test__header_value_parser.py
@@ -89,6 +89,10 @@ class TestParser(TestParserMixin, TestEmailBase):
         with self.assertRaises(errors.HeaderParseError):
             parser.get_encoded_word('=?abc?=')
 
+    def test_get_encoded_word_invalid_cte(self):
+        with self.assertRaises(errors.HeaderParseError):
+            parser.get_encoded_word('=?utf-8?X?somevalue?=')
+
     def test_get_encoded_word_valid_ew(self):
         self._test_get_x(parser.get_encoded_word,
                          '=?us-ascii?q?this_is_a_test?=  bird',
@@ -399,6 +403,14 @@ class TestParser(TestParserMixin, TestEmailBase):
             [],
             '')
 
+    def test_get_unstructured_invalid_ew_cte(self):
+        self._test_get_x(self._get_unst,
+            '=?utf-8?X?=somevalue?=',
+            '=?utf-8?X?=somevalue?=',
+            '=?utf-8?X?=somevalue?=',
+            [],
+            '')
+
     # get_qp_ctext
 
     def test_get_qp_ctext_only(self):
diff --git a/Misc/NEWS.d/next/Library/2019-10-05-02-07-52.bpo-38332.hwrPN7.rst b/Misc/NEWS.d/next/Library/2019-10-05-02-07-52.bpo-38332.hwrPN7.rst
new file mode 100644
index 0000000..600c702
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-10-05-02-07-52.bpo-38332.hwrPN7.rst
@@ -0,0 +1,3 @@
+Prevent :exc:`KeyError` thrown by :func:`_encoded_words.decode` when given
+an encoded-word with invalid content-type encoding from propagating all the
+way to :func:`email.message.get`.