From ae872919f2833567d5f14f10f9729989ae2f39b8 Mon Sep 17 00:00:00 2001
From: Saba Siddique <sabasiddique001@gmail.com>
Date: Tue, 3 Feb 2026 16:02:37 +0500
Subject: [PATCH 1/4] gh-144412: require tuple args in pickle REDUCE

---
 Lib/pickle.py            | 2 ++
 Lib/test/pickletester.py | 1 +
 2 files changed, 3 insertions(+)

diff --git a/Lib/pickle.py b/Lib/pickle.py
index 71c12c50f7f035..af2803c15be199 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -1724,6 +1724,8 @@ def load_reduce(self):
         stack = self.stack
         args = stack.pop()
         func = stack[-1]
+        if not isinstance(args, tuple):
+            raise TypeError("argument list must be a tuple")
         stack[-1] = func(*args)
     dispatch[REDUCE[0]] = load_reduce
 
diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
index d2b8d036bfd9e7..2126e30cc6cbf3 100644
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -1435,6 +1435,7 @@ def test_bad_reduce(self):
         self.assertEqual(self.loads(b'cbuiltins\nint\n)R.'), 0)
         self.check_unpickling_error(TypeError, b'N)R.')
         self.check_unpickling_error(TypeError, b'cbuiltins\nint\nNR.')
+        self.check_unpickling_error(TypeError, b'cbuiltins\nint\nNR.')
 
     def test_bad_newobj(self):
         error = (pickle.UnpicklingError, TypeError)

From e6dfc103efd9b762316ce120e02ca718e7fbcd8c Mon Sep 17 00:00:00 2001
From: Saba Siddique <sabasiddique001@gmail.com>
Date: Tue, 3 Feb 2026 16:06:39 +0500
Subject: [PATCH 2/4] gh-144412: add NEWS entry for pickle REDUCE fix

---
 .../next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst

diff --git a/Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst b/Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst
new file mode 100644
index 00000000000000..8b4c77eb3829df
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst
@@ -0,0 +1,2 @@
+``pickle.load_reduce()`` now requires a tuple for ``REDUCE`` arguments to
+match ``_pickle``; non-tuple argument lists now raise ``TypeError``.

From bcfd96f6702518177208a2337a044bf01d549177 Mon Sep 17 00:00:00 2001
From: Saba Siddique <sabasiddique001@gmail.com>
Date: Tue, 3 Feb 2026 16:20:53 +0500
Subject: [PATCH 3/4] gh-144412: rename NEWS entry file

---
 .../next/Library/2026-02-03-12-00-00.gh-issue-144412.q7KpXg.rst | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2026-02-03-12-00-00.gh-issue-144412.q7KpXg.rst

diff --git a/Misc/NEWS.d/next/Library/2026-02-03-12-00-00.gh-issue-144412.q7KpXg.rst b/Misc/NEWS.d/next/Library/2026-02-03-12-00-00.gh-issue-144412.q7KpXg.rst
new file mode 100644
index 00000000000000..8b4c77eb3829df
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-02-03-12-00-00.gh-issue-144412.q7KpXg.rst
@@ -0,0 +1,2 @@
+``pickle.load_reduce()`` now requires a tuple for ``REDUCE`` arguments to
+match ``_pickle``; non-tuple argument lists now raise ``TypeError``.

From c94ad8b2c790a3f43f90ab1140e049cdf67cfc21 Mon Sep 17 00:00:00 2001
From: Sabaa Siddique <103187876+sabasiddique1@users.noreply.github.com>
Date: Tue, 3 Feb 2026 16:23:20 +0500
Subject: [PATCH 4/4] Delete
 Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst

---
 .../next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst | 2 --
 1 file changed, 2 deletions(-)
 delete mode 100644 Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst

diff --git a/Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst b/Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst
deleted file mode 100644
index 8b4c77eb3829df..00000000000000
--- a/Misc/NEWS.d/next/Library/2026-01-31-12-40-00.gh-issue-000000.vXyZ0a.rst
+++ /dev/null
@@ -1,2 +0,0 @@
-``pickle.load_reduce()`` now requires a tuple for ``REDUCE`` arguments to
-match ``_pickle``; non-tuple argument lists now raise ``TypeError``.