diff --git a/providers/cncf/kubernetes/src/airflow/providers/cncf/kubernetes/utils/xcom_sidecar.py b/providers/cncf/kubernetes/src/airflow/providers/cncf/kubernetes/utils/xcom_sidecar.py
index 5bf26975b32c3..5b6f34d8bd988 100644
--- a/providers/cncf/kubernetes/src/airflow/providers/cncf/kubernetes/utils/xcom_sidecar.py
+++ b/providers/cncf/kubernetes/src/airflow/providers/cncf/kubernetes/utils/xcom_sidecar.py
@@ -62,10 +62,10 @@ def add_xcom_sidecar(
 ) -> k8s.V1Pod:
     """Add sidecar."""
     pod_cp = copy.deepcopy(pod)
-    pod_cp.spec.volumes = pod.spec.volumes or []
-    pod_cp.spec.volumes.insert(0, PodDefaults.VOLUME)
+    pod_cp.spec.volumes = pod_cp.spec.volumes or []
+    pod_cp.spec.volumes.insert(0, copy.deepcopy(PodDefaults.VOLUME))
     pod_cp.spec.containers[0].volume_mounts = pod_cp.spec.containers[0].volume_mounts or []
-    pod_cp.spec.containers[0].volume_mounts.insert(0, PodDefaults.VOLUME_MOUNT)
+    pod_cp.spec.containers[0].volume_mounts.insert(0, copy.deepcopy(PodDefaults.VOLUME_MOUNT))
     sidecar = copy.deepcopy(PodDefaults.SIDECAR_CONTAINER)
     sidecar.image = sidecar_container_image or PodDefaults.SIDECAR_CONTAINER.image
     if sidecar_container_resources:
diff --git a/providers/cncf/kubernetes/tests/unit/cncf/kubernetes/utils/test_xcom_sidecar.py b/providers/cncf/kubernetes/tests/unit/cncf/kubernetes/utils/test_xcom_sidecar.py
index 7fc9e9b4796ab..34b04673923d2 100644
--- a/providers/cncf/kubernetes/tests/unit/cncf/kubernetes/utils/test_xcom_sidecar.py
+++ b/providers/cncf/kubernetes/tests/unit/cncf/kubernetes/utils/test_xcom_sidecar.py
@@ -69,3 +69,20 @@ def test_add_xcom_sidecar_empty_security_context():
 def test_add_xcom_sidecar_does_not_mutate_shared_default():
     add_xcom_sidecar(_base_pod(), sidecar_container_security_context={"readOnlyRootFilesystem": True})
     assert PodDefaults.SIDECAR_CONTAINER.security_context is None
+
+
+def test_add_xcom_sidecar_does_not_mutate_input_pod_volumes():
+    pod = _base_pod()
+    pod.spec.volumes = [k8s.V1Volume(name="data", empty_dir=k8s.V1EmptyDirVolumeSource())]
+
+    result = add_xcom_sidecar(pod)
+
+    assert [v.name for v in pod.spec.volumes] == ["data"]
+    assert [v.name for v in result.spec.volumes] == ["xcom", "data"]
+
+
+def test_add_xcom_sidecar_copies_default_volume_and_mount():
+    result = add_xcom_sidecar(_base_pod())
+
+    assert result.spec.volumes[0] is not PodDefaults.VOLUME
+    assert result.spec.containers[0].volume_mounts[0] is not PodDefaults.VOLUME_MOUNT