From d238824e746641b9c88308bf5ceb416ea31cbfb4 Mon Sep 17 00:00:00 2001
From: Bujjibabukatta <bujjubabukatta6@gmail.com>
Date: Sat, 11 Jul 2026 15:34:13 +0530
Subject: [PATCH] Fix BaseSerialization double-wrapping args for builtin
 exceptions

---
 .../serialization/serialized_objects.py       |  2 +-
 .../serialization/test_serialized_objects.py  | 21 +++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/airflow-core/src/airflow/serialization/serialized_objects.py b/airflow-core/src/airflow/serialization/serialized_objects.py
index 54bc3389c64ce..ef4853c73e811 100644
--- a/airflow-core/src/airflow/serialization/serialized_objects.py
+++ b/airflow-core/src/airflow/serialization/serialized_objects.py
@@ -555,7 +555,7 @@ def serialize(
                 cls.serialize(
                     {
                         "exc_cls_name": var.__class__.__name__,
-                        "args": [var.args],
+                        "args": list(var.args),
                         "kwargs": {},
                     },
                     strict=strict,
diff --git a/airflow-core/tests/unit/serialization/test_serialized_objects.py b/airflow-core/tests/unit/serialization/test_serialized_objects.py
index 8495100cc47fc..4ec1cc09ff7f4 100644
--- a/airflow-core/tests/unit/serialization/test_serialized_objects.py
+++ b/airflow-core/tests/unit/serialization/test_serialized_objects.py
@@ -580,6 +580,27 @@ def test_roundtrip_exceptions():
     assert deser.reschedule_date == some_date
 
 
+@pytest.mark.parametrize(
+    "exc",
+    [
+        KeyError("boom"),
+        AttributeError("attr missing"),
+        KeyError("a", "b"),
+        KeyError(),
+    ],
+)
+def test_roundtrip_builtin_exceptions(exc):
+    """BaseSerialization should preserve ``args`` when round-tripping built-in exceptions.
+
+    Regression test for https://github.com/apache/airflow/issues/69743 where
+    a KeyError("boom") would deserialize with args == (("boom",),) instead of ("boom",).
+    """
+    ser = BaseSerialization.serialize(exc)
+    deser = BaseSerialization.deserialize(ser)
+    assert isinstance(deser, type(exc))
+    assert deser.args == exc.args
+
+
 @pytest.mark.parametrize(
     "concurrency_parameter",
     [