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diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
index 1fb8cb4..9815e4e 100644
--- a/Lib/email/_header_value_parser.py
+++ b/Lib/email/_header_value_parser.py
@@ -1561,6 +1561,8 @@ def get_domain(value):
token, value = get_dot_atom(value)
except errors.HeaderParseError:
token, value = get_atom(value)
+ if value and value[0] == '@':
+ raise errors.HeaderParseError('Invalid Domain')
if leader is not None:
token[:0] = [leader]
domain.append(token)
diff --git a/Lib/email/_parseaddr.py b/Lib/email/_parseaddr.py
index cdfa372..41ff6f8 100644
--- a/Lib/email/_parseaddr.py
+++ b/Lib/email/_parseaddr.py
@@ -379,7 +379,12 @@ class AddrlistClass:
aslist.append('@')
self.pos += 1
self.gotonext()
- return EMPTYSTRING.join(aslist) + self.getdomain()
+ domain = self.getdomain()
+ if not domain:
+ # Invalid domain, return an empty address instead of returning a
+ # local part to denote failed parsing.
+ return EMPTYSTRING
+ return EMPTYSTRING.join(aslist) + domain
def getdomain(self):
"""Get the complete domain name from an address."""
@@ -394,6 +399,10 @@ class AddrlistClass:
elif self.field[self.pos] == '.':
self.pos += 1
sdlist.append('.')
+ elif self.field[self.pos] == '@':
+ # bpo-34155: Don't parse domains with two `@` like
+ # `a@malicious.org@important.com`.
+ return EMPTYSTRING
elif self.field[self.pos] in self.atomends:
break
else:
diff --git a/Lib/test/test_email/test__header_value_parser.py b/Lib/test/test_email/test__header_value_parser.py
index 676732b..577dc43 100644
--- a/Lib/test/test_email/test__header_value_parser.py
+++ b/Lib/test/test_email/test__header_value_parser.py
@@ -1418,6 +1418,16 @@ class TestParser(TestParserMixin, TestEmailBase):
self.assertEqual(addr_spec.domain, 'example.com')
self.assertEqual(addr_spec.addr_spec, 'star.a.star@example.com')
+ def test_get_addr_spec_multiple_domains(self):
+ with self.assertRaises(errors.HeaderParseError):
+ parser.get_addr_spec('star@a.star@example.com')
+
+ with self.assertRaises(errors.HeaderParseError):
+ parser.get_addr_spec('star@a@example.com')
+
+ with self.assertRaises(errors.HeaderParseError):
+ parser.get_addr_spec('star@172.17.0.1@example.com')
+
# get_obs_route
def test_get_obs_route_simple(self):
diff --git a/Lib/test/test_email/test_email.py b/Lib/test/test_email/test_email.py
index f97ccc6..68d0522 100644
--- a/Lib/test/test_email/test_email.py
+++ b/Lib/test/test_email/test_email.py
@@ -3035,6 +3035,20 @@ class TestMiscellaneous(TestEmailBase):
self.assertEqual(utils.parseaddr('<>'), ('', ''))
self.assertEqual(utils.formataddr(utils.parseaddr('<>')), '')
+ def test_parseaddr_multiple_domains(self):
+ self.assertEqual(
+ utils.parseaddr('a@b@c'),
+ ('', '')
+ )
+ self.assertEqual(
+ utils.parseaddr('a@b.c@c'),
+ ('', '')
+ )
+ self.assertEqual(
+ utils.parseaddr('a@172.17.0.1@c'),
+ ('', '')
+ )
+
def test_noquote_dump(self):
self.assertEqual(
utils.formataddr(('A Silly Person', 'person@dom.ain')),
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