--- a/vllm/model_executor/offloader/expert_activation_registry.py
+++ b/vllm/model_executor/offloader/expert_activation_registry.py
@@ -316,7 +316,27 @@
 
 
 def _glm53_kv_bytes_per_token(cfg: "VllmConfig") -> int:
-    return 13600
+    per_tok = 13600
+    # FORK-LOCAL (patches/glm53-dflash-04-kv-groups-draft): with a dflash/dspark
+    # drafter, the KV spec set gains the drafter's attention layers and the aux
+    # hidden-state cache (one bf16 hidden vector per target aux layer per
+    # token). Both are full-length per-token costs the aliased glm5 pool
+    # cannot absorb, so the reserve must include them. The drafter is a 5-layer
+    # qwen3 (8 kv heads x 128 x K+V x bf16 = 4096 B/token); the aux count is
+    # the dflash target_layer_ids count (5).
+    # NOTE: use_aux_hidden_state_outputs lives on the gpu_model_runner
+    # instance (gpu_model_runner.py:623/678), not on the spec config -- it is
+    # not set yet when the expert plan runs. The spec-config METHOD is the
+    # plan-time signal for the same fact.
+    sc = getattr(cfg, "speculative_config", None)
+    if sc is not None and getattr(sc, "method", "") in (
+        "dflash",
+        "dspark",
+        "extract_hidden_states",
+    ):
+        hidden = int(cfg.model_config.hf_config.hidden_size)
+        per_tok += 5 * hidden * 2 + 4096
+    return per_tok
 
 
 for _arch in ("Glm5NextForConditionalGeneration", "Glm5NextForCausalLM"):