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gh-161100: Fix IPv6Interface.is_unspecified for IPv4-mapped addresses #161101

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Merged
gpshead merged 1 commit into from
Nov 1, 2026
Merged

gh-161100: Fix IPv6Interface.is_unspecified for IPv4-mapped addresses #161101

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2 changes: 1 addition & 1 deletion Lib/ipaddress.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2326,7 +2326,7 @@ def with_hostmask(self):

@property
def is_unspecified(self):
return self._ip == 0 and self.network.is_unspecified
return super().is_unspecified and self.network.is_unspecified

@property
def is_loopback(self):
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19 changes: 19 additions & 0 deletions Lib/test/test_ipaddress.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2495,6 +2495,14 @@ def testReservedIpv6(self):
self.assertEqual(False, ipaddress.ip_network('::1').is_unspecified)
self.assertEqual(False, ipaddress.ip_network('::/127').is_unspecified)

self.assertTrue(ipaddress.ip_interface('::/128').is_unspecified)
self.assertTrue(
ipaddress.ip_interface('::ffff:0.0.0.0/128').is_unspecified)
self.assertFalse(ipaddress.ip_interface('::/127').is_unspecified)
self.assertFalse(
ipaddress.ip_interface('::ffff:0.0.0.0/127').is_unspecified)
self.assertFalse(ipaddress.ip_interface('::1/128').is_unspecified)

self.assertEqual(True,
ipaddress.ip_network('2001::1/128').is_private)
self.assertEqual(True,
Expand Down Expand Up @@ -2588,6 +2596,17 @@ def testIpv4MappedProperties(self):
self.assertEqual(ipv4.is_link_local, ipv6.is_link_local)
self.assertEqual(ipv4.is_loopback, ipv6.is_loopback)

ipv4 = ipaddress.IPv4Interface(addr4)
ipv6 = ipaddress.IPv6Interface(f"::ffff:{addr4}")

self.assertEqual(ipv4.is_global, ipv6.is_global)
self.assertEqual(ipv4.is_private, ipv6.is_private)
self.assertEqual(ipv4.is_reserved, ipv6.is_reserved)
self.assertEqual(ipv4.is_multicast, ipv6.is_multicast)
self.assertEqual(ipv4.is_unspecified, ipv6.is_unspecified)
self.assertEqual(ipv4.is_link_local, ipv6.is_link_local)
self.assertEqual(ipv4.is_loopback, ipv6.is_loopback)

def testIpv4MappedPrivateCheck(self):
self.assertEqual(
True, ipaddress.ip_address('::ffff:192.168.1.1').is_private)
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2026-10-22-05-20-06.gh-issue-161100.pLgnlA.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix :attr:`!ipaddress.IPv6Interface.is_unspecified` returning ``False`` for
the IPv4-mapped address ``::ffff:0.0.0.0``. It now gives the same result as
:attr:`ipaddress.IPv6Address.is_unspecified`.
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