gh-134062: Fix hash collisions in IPv4Network and IPv6Network (GH-134063)

gh-134062: Fix hash collisions in IPv4Network and IPv6Network
gh-134062: Add hash collision regression test

diff --git a/Lib/ipaddress.py b/Lib/ipaddress.py
index 703fa289dda1fb50903c9ec92b1a62e2ef9a4cf2..d8a84f33264dc5b6cfb2a70a4d9a6ae48235e4a3 100644 (file)
--- a/Lib/ipaddress.py
+++ b/Lib/ipaddress.py
@@ -729,7 +729,7 @@ class _BaseNetwork(_IPAddressBase):
             return NotImplemented
 
     def __hash__(self):
-        return hash(int(self.network_address) ^ int(self.netmask))
+        return hash((int(self.network_address), int(self.netmask)))
 
     def __contains__(self, other):
         # always false if one is v4 and the other is v6.

diff --git a/Lib/test/test_ipaddress.py b/Lib/test/test_ipaddress.py
index d04012d1afd5408f8faa8380f1d6320de9ab630c..a06608d0016253f97b86c2412b8464b1a9c7cda8 100644 (file)
--- a/Lib/test/test_ipaddress.py
+++ b/Lib/test/test_ipaddress.py
@@ -2762,6 +2762,34 @@ class IpaddrUnitTest(unittest.TestCase):
         ipv6_address2 = ipaddress.IPv6Interface("2001:658:22a:cafe:200:0:0:2")
         self.assertNotEqual(ipv6_address1.__hash__(), ipv6_address2.__hash__())
 
+    # issue 134062 Hash collisions in IPv4Network and IPv6Network
+    def testNetworkV4HashCollisions(self):
+        self.assertNotEqual(
+            ipaddress.IPv4Network("192.168.1.255/32").__hash__(),
+            ipaddress.IPv4Network("192.168.1.0/24").__hash__()
+        )
+        self.assertNotEqual(
+            ipaddress.IPv4Network("172.24.255.0/24").__hash__(),
+            ipaddress.IPv4Network("172.24.0.0/16").__hash__()
+        )
+        self.assertNotEqual(
+            ipaddress.IPv4Network("192.168.1.87/32").__hash__(),
+            ipaddress.IPv4Network("192.168.1.86/31").__hash__()
+        )
+
+    # issue 134062 Hash collisions in IPv4Network and IPv6Network
+    def testNetworkV6HashCollisions(self):
+        self.assertNotEqual(
+            ipaddress.IPv6Network("fe80::/64").__hash__(),
+            ipaddress.IPv6Network("fe80::ffff:ffff:ffff:0/112").__hash__()
+        )
+        self.assertNotEqual(
+            ipaddress.IPv4Network("10.0.0.0/8").__hash__(),
+            ipaddress.IPv6Network(
+                "ffff:ffff:ffff:ffff:ffff:ffff:aff:0/112"
+            ).__hash__()
+        )
+
 
 if __name__ == '__main__':
     unittest.main()

diff --git a/Misc/NEWS.d/next/Library/2025-05-15-14-27-01.gh-issue-134062.fRbJet.rst b/Misc/NEWS.d/next/Library/2025-05-15-14-27-01.gh-issue-134062.fRbJet.rst
new file mode 100644 (file)
index 0000000..f62a3ec
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-05-15-14-27-01.gh-issue-134062.fRbJet.rst
@@ -0,0 +1,3 @@
+:mod:`ipaddress`: fix collisions in :meth:`~object.__hash__` for
+:class:`~ipaddress.IPv4Network` and :class:`~ipaddress.IPv6Network`
+objects.