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[3.13] Correctly fold unknown-8bit originating from encoded words. (GH-142517) #143147

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Merged
bitdancer merged 2 commits into from
Dec 24, 2025
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[3.13] Correctly fold unknown-8bit originating from encoded words. (GH-142517) #143147

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8b7e2e6
Correctly fold unknown-8bit originating from encoded words. (GH-142517)
bitdancer Dec 24, 2025
e539466
Update Misc/NEWS.d/next/Library/2025-12-10-10-00-06.gh-issue-142517.f…
bitdancer Dec 24, 2025
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2 changes: 1 addition & 1 deletion Lib/email/_encoded_words.py
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Original file line number Diff line number Diff line change
Expand Up @@ -219,7 +219,7 @@ def encode(string, charset='utf-8', encoding=None, lang=''):

"""
if charset == 'unknown-8bit':
bstring = string.encode('ascii', 'surrogateescape')
bstring = string.encode('utf-8', 'surrogateescape')
else:
bstring = string.encode(charset)
if encoding is None:
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8 changes: 8 additions & 0 deletions Lib/test/test_email/test__header_value_parser.py
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Expand Up @@ -3340,5 +3340,13 @@ def test_fold_unfoldable_element_stealing_whitespace(self):
token = parser.get_address_list(text)[0]
self._test(token, expected, policy=policy)

def test_encoded_word_with_undecodable_bytes(self):
self._test(parser.get_address_list(
' =?utf-8?Q?=E5=AE=A2=E6=88=B6=E6=AD=A3=E8=A6=8F=E4=BA=A4=E7?='
)[0],
' =?unknown-8bit?b?5a6i5oi25q2j6KaP5Lqk5w==?=\n',
)


if __name__ == '__main__':
unittest.main()
4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Library/2025-12-10-10-00-06.gh-issue-142517.fG4hbe.rst
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@@ -0,0 +1,4 @@
The non-``compat32`` :mod:`email` policies now correctly handle refolding
encoded words that contain bytes that can not be decoded in their specified
character set. Previously this resulting in an encoding exception during
folding.
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