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[3.15] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) by miss-islington · Pull Request #156017 · python/cpython · GitHub

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[3.15] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) #156017

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Merged
pablogsal merged 1 commit into from
Aug 18, 2026
Conversation 0 Commits 1 Checks 60 Files changed
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[3.15] gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293) #156017

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323 changes: 257 additions & 66 deletions Lib/stringprep.py
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9 changes: 9 additions & 0 deletions Lib/test/test_codecs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1623,6 +1623,15 @@ def test_builtin_encode(self):
self.assertEqual("pyth\xf6n.org".encode("idna"), b"xn--pythn-mua.org")
self.assertEqual("pyth\xf6n.org.".encode("idna"), b"xn--pythn-mua.org.")

@support.subTests(['unicode', 'encoded'], [
('\N{CHEROKEE LETTER A}\N{CHEROKEE LETTER A}', b"xn--58da"),
('\N{GEORGIAN CAPITAL LETTER AN}.', b"xn--7md."),
('\N{CYRILLIC LETTER PALOCHKA}.example', b"xn--d5a.example"),
('\N{ROMAN NUMERAL REVERSED ONE HUNDRED}.example.', b"xn--q5g.example."),
])
def test_new_unicode_case_folding(self, unicode, encoded):
self.assertEqual(unicode.encode("idna"), encoded)

def test_builtin_encode_invalid(self):
for case, expected in self.invalid_encode_testcases:
with self.subTest(case=case, expected=expected):
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22 changes: 10 additions & 12 deletions Lib/test/test_unicodedata.py
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Original file line number Diff line number Diff line change
Expand Up @@ -321,7 +321,7 @@ def test_category(self):
self.assertRaises(TypeError, self.db.category, 'xx')

def test_bidirectional(self):
self.assertEqual(self.db.bidirectional('\uFFFE'), 'BN')
self.assertEqual(self.db.bidirectional('\uFFFE'), '' if self.old else 'BN')
self.assertEqual(self.db.bidirectional(' '), 'WS')
self.assertEqual(self.db.bidirectional('A'), 'L')
self.assertEqual(self.db.bidirectional('\U00020000'), 'L')
Expand Down Expand Up @@ -350,15 +350,13 @@ def test_bidirectional(self):
self.assertRaises(TypeError, self.db.bidirectional, 'xx')

def test_bidirectional_unassigned(self):
if self.old:
return
self.assertEqual(self.db.bidirectional('\u0378'), 'L')
self.assertEqual(self.db.bidirectional('\u077F'), 'AL')
self.assertEqual(self.db.bidirectional('\u20CF'), 'ET')
self.assertEqual(self.db.bidirectional('\u0590'), 'R')
self.assertEqual(self.db.bidirectional('\uFFFF'), 'BN')
self.assertEqual(self.db.bidirectional('\U0001FFFE'), 'BN')
self.assertEqual(self.db.bidirectional('\U00010D01'), 'AL')
self.assertEqual(self.db.bidirectional('\u0378'), '' if self.old else 'L')
self.assertEqual(self.db.bidirectional('\u077F'), '' if self.old else 'AL')
self.assertEqual(self.db.bidirectional('\u20CF'), '' if self.old else 'ET')
self.assertEqual(self.db.bidirectional('\u0590'), '' if self.old else 'R')
self.assertEqual(self.db.bidirectional('\uFFFF'), '' if self.old else 'BN')
self.assertEqual(self.db.bidirectional('\U0001FFFE'), '' if self.old else 'BN')
self.assertEqual(self.db.bidirectional('\U00010D01'), '' if self.old else 'AL')

def test_decomposition(self):
self.assertEqual(self.db.decomposition('\uFFFE'),'')
Expand Down Expand Up @@ -1104,9 +1102,9 @@ def test_block_invalid_input(self):
class Unicode_3_2_0_FunctionsTest(unittest.TestCase, BaseUnicodeFunctionsTest):
db = unicodedata.ucd_3_2_0
old = True
expectedchecksum = ('cb5bbbd1f55b67371e18222b90a8e21c87f16b72'
expectedchecksum = ('883824cb6c0ccf994e4451ebf281e2d6d479af47'
if quicktest else
'74936dffe949d99203a47e6a66565b2fc337bae7')
'68cd01e2c680b851c1fcab012efb5635b2229c2b')


class UnicodeMiscTest(unittest.TestCase):
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Security/2026-08-06-11-43-20.gh-issue-155292.j4pHBO.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Change the :mod:`stringprep` module and :mod:`encodings.idna` codec to not
consider Unicode codepoint attributes beyond those defined in :rfc:`3454`.
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