diff --git a/python/sglang/srt/utils/hf_transformers_utils.py b/python/sglang/srt/utils/hf_transformers_utils.py
index bafff0464..31dfaadad 100644
--- a/python/sglang/srt/utils/hf_transformers_utils.py
+++ b/python/sglang/srt/utils/hf_transformers_utils.py
@@ -543,6 +543,27 @@ def get_config(
                 else:
                     raise
 
+    if (
+        config.architectures is not None
+        and config.architectures[0] == "GlmMoeDsaForCausalLM"
+    ):
+        # GlmMoeDsaConfig.__init__ has no **kwargs, so HF drops raw config.json
+        # fields the DSA / IndexCache path reads via getattr (index_topk_freq,
+        # index_topk_pattern, index_skip_topk_offset) and may clobber
+        # qk_rope_head_dim. Re-read them from config.json and restore.
+        # (upstream PR #27114) Remove once transformers >= 5.10 (HF PR #46338).
+        raw_config, _ = PretrainedConfig.get_config_dict(model, revision=revision)
+        for key in (
+            "qk_rope_head_dim",
+            "index_topk_freq",
+            "index_topk_pattern",
+            "index_skip_topk_offset",
+        ):
+            if key in raw_config:
+                setattr(config, key, raw_config[key])
+        if hasattr(config, "qk_head_dim") and hasattr(config, "qk_nope_head_dim"):
+            config.qk_head_dim = config.qk_nope_head_dim + config.qk_rope_head_dim
+
     if (
         config.architectures is not None
         and config.architectures[0] == "Phi4MMForCausalLM"