CVE-2025-0938: python3, backport upstream fix (no version bump)

pkgs/development/interpreters/python/cpython/CVE-2025-0938.patch

@@ -0,0 +1,38 @@
+diff --git a/Lib/urllib/parse.py b/Lib/urllib/parse.py
+index c412c729852272..9d51f4c6812b57 100644
+--- a/Lib/urllib/parse.py
++++ b/Lib/urllib/parse.py
+@@ -439,6 +439,23 @@ def _checknetloc(netloc):
+             raise ValueError("netloc '" + netloc + "' contains invalid " +
+                              "characters under NFKC normalization")
+
++def _check_bracketed_netloc(netloc):
++    # Note that this function must mirror the splitting
++    # done in NetlocResultMixins._hostinfo().
++    hostname_and_port = netloc.rpartition('@')[2]
++    before_bracket, have_open_br, bracketed = hostname_and_port.partition('[')
++    if have_open_br:
++        # No data is allowed before a bracket.
++        if before_bracket:
++            raise ValueError("Invalid IPv6 URL")
++        hostname, _, port = bracketed.partition(']')
++        # No data is allowed after the bracket but before the port delimiter.
++        if port and not port.startswith(":"):
++            raise ValueError("Invalid IPv6 URL")
++    else:
++        hostname, _, port = hostname_and_port.partition(':')
++    _check_bracketed_host(hostname)
++
+ # Valid bracketed hosts are defined in
+ # https://www.rfc-editor.org/rfc/rfc3986#page-49 and https://url.spec.whatwg.org/
+ def _check_bracketed_host(hostname):
+@@ -505,8 +522,7 @@ def _urlsplit(url, scheme=None, allow_fragments=True):
+                 (']' in netloc and '[' not in netloc)):
+             raise ValueError("Invalid IPv6 URL")
+         if '[' in netloc and ']' in netloc:
+-            bracketed_host = netloc.partition('[')[2].partition(']')[0]
+-            _check_bracketed_host(bracketed_host)
++            _check_bracketed_netloc(netloc)
+     if allow_fragments and '#' in url:
+         url, fragment = url.split('#', 1)
+     if '?' in url:

pkgs/development/interpreters/python/cpython/default.nix

@@ -252,6 +252,7 @@ in with passthru; stdenv.mkDerivation (finalAttrs: {
     # (since it will do a futile invocation of gcc (!) to find
     # libuuid, slowing down program startup a lot).
     noldconfigPatch
+    ./CVE-2025-0938.patch
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform && stdenv.hostPlatform.isFreeBSD) [
     # Cross compilation only supports a limited number of "known good"
     # configurations. If you're reading this and it's been a long time