diff --git a/python/sglang/srt/disaggregation/mooncake/conn.py b/python/sglang/srt/disaggregation/mooncake/conn.py
index 2bbfbd6de..5796cbf7c 100644
--- a/python/sglang/srt/disaggregation/mooncake/conn.py
+++ b/python/sglang/srt/disaggregation/mooncake/conn.py
@@ -822,13 +822,24 @@ class MooncakeKVManager(CommonKVManager):
                 if dst_state_indices is not None
                 else np.asarray(req.dst_state_indices, dtype=np.int32)
             )
-            if len(prefill_state_indices) < len(effective_dst_state_indices):
+            # Clip src/dst state indices to the shorter side so the transfer never
+            # reads past prefill_state_indices or writes past dst_state_indices.
+            # Ported from upstream sgl-project/sglang #23323 (the prior logic only
+            # handled prefill<dst and clipped the wrong array, a no-op).
+            if len(prefill_state_indices) > len(effective_dst_state_indices):
                 logger.warning(
                     f"len(prefill_state_indices) = {len(prefill_state_indices)}, len(dst_state_indices) = {len(effective_dst_state_indices)}"
                 )
                 prefill_state_indices = prefill_state_indices[
                     : len(effective_dst_state_indices)
                 ]
+            elif len(prefill_state_indices) < len(effective_dst_state_indices):
+                logger.warning(
+                    f"len(prefill_state_indices) = {len(prefill_state_indices)}, len(dst_state_indices) = {len(effective_dst_state_indices)}"
+                )
+                effective_dst_state_indices = effective_dst_state_indices[
+                    : len(prefill_state_indices)
+                ]
             src_state_data_ptrs = self.kv_args.state_data_ptrs
             dst_state_ptrs = dst_state_data_ptrs
             state_item_lens = self.kv_args.state_item_lens