https://github.com/python/cpython/commit/f3fc0c16e08b317cb201cf1073e934e6909f1251
commit: f3fc0c16e08b317cb201cf1073e934e6909f1251
branch: main
author: Mike Salvatore <[email protected]>
committer: gpshead <[email protected]>
date: 2025-05-21T19:48:10-07:00
summary:
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
files:
A Misc/NEWS.d/next/Library/2025-05-15-14-27-01.gh-issue-134062.fRbJet.rst
M Lib/ipaddress.py
M Lib/test/test_ipaddress.py
diff --git a/Lib/ipaddress.py b/Lib/ipaddress.py
index 703fa289dda1fb..d8a84f33264dc5 100644
--- a/Lib/ipaddress.py
+++ b/Lib/ipaddress.py
@@ -729,7 +729,7 @@ def __eq__(self, other):
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 d04012d1afd540..a06608d0016253 100644
--- a/Lib/test/test_ipaddress.py
+++ b/Lib/test/test_ipaddress.py
@@ -2762,6 +2762,34 @@ def testV6HashIsNotConstant(self):
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
index 00000000000000..f62a3ec480193d
--- /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.
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