diff --git a/litellm/proxy/guardrails/guardrail_hooks/bedrock_guardrails.py b/litellm/proxy/guardrails/guardrail_hooks/bedrock_guardrails.py
index 8ade4a011f7..2c05bfce601 100644
--- a/litellm/proxy/guardrails/guardrail_hooks/bedrock_guardrails.py
+++ b/litellm/proxy/guardrails/guardrail_hooks/bedrock_guardrails.py
@@ -677,25 +677,72 @@ class BedrockGuardrail(CustomGuardrail, BaseAWSLLM):
         except Exception:
             return model.partition("/")[0]
 
+    @staticmethod
+    def _router_allows_bedrock(request_data: Mapping[str, object]) -> bool | None:
+        model: Final[object | None] = request_data.get("model")
+        if not isinstance(model, str):
+            return False
+
+        try:
+            from litellm.proxy.proxy_server import llm_router
+        except ImportError:
+            return None
+        if llm_router is None:
+            return None
+
+        metadata: Final = request_data.get("metadata")
+        litellm_metadata: Final = request_data.get("litellm_metadata")
+        team_id: Final[object | None] = (
+            metadata.get("user_api_key_team_id")
+            if isinstance(metadata, Mapping)
+            else litellm_metadata.get("user_api_key_team_id")
+            if isinstance(litellm_metadata, Mapping)
+            else None
+        )
+        try:
+            deployments: Final = llm_router.get_model_list(
+                model_name=model,
+                team_id=team_id if isinstance(team_id, str) else None,
+            ) or []
+        except Exception:
+            return False
+        if not deployments:
+            return False
+
+        providers: list[str] = []
+        for deployment in deployments:
+            params: object = deployment.get("litellm_params") if isinstance(deployment, Mapping) else None
+            provider: object = params.get("custom_llm_provider") if isinstance(params, Mapping) else None
+            if not isinstance(provider, str) and isinstance(params, Mapping):
+                deployment_model: Final[object | None] = params.get("model")
+                provider = (
+                    BedrockGuardrail._resolve_model_provider(deployment_model)
+                    if isinstance(deployment_model, str)
+                    else None
+                )
+            if not isinstance(provider, str):
+                return False
+            providers.append(provider)
+        return bool(providers) and all(provider in ("bedrock", "bedrock_converse") for provider in providers)
+
     @staticmethod
     def _get_bedrock_api_key(request_data: Mapping[str, object] | None) -> str | None:
         if not request_data:
             return None
 
-        top_level_provider: Final[object | None] = request_data.get("custom_llm_provider")
-        request_provider: Final[str | None] = (
-            top_level_provider if isinstance(top_level_provider, str) else None
-        )
+        api_key: Final[object | None] = request_data.get("api_key")
+        if not isinstance(api_key, str):
+            return None
+
+        router_allows_bedrock: Final = BedrockGuardrail._router_allows_bedrock(request_data)
+        if router_allows_bedrock is not None:
+            return api_key if router_allows_bedrock else None
+
         model: Final[object | None] = request_data.get("model")
         model_provider: Final[str | None] = (
             BedrockGuardrail._resolve_model_provider(model) if isinstance(model, str) else None
         )
-        custom_llm_provider: Final[str | None] = request_provider or model_provider
-        if custom_llm_provider not in ("bedrock", "bedrock_converse"):
-            return None
-
-        api_key: Final[object | None] = request_data.get("api_key")
-        return api_key if isinstance(api_key, str) else None
+        return api_key if model_provider in ("bedrock", "bedrock_converse") else None
 
     def _load_credentials(
         self,
diff --git a/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_bedrock_guardrails.py b/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_bedrock_guardrails.py
index a1dbbaa5953..bf8b48625e8 100644
--- a/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_bedrock_guardrails.py
+++ b/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_bedrock_guardrails.py
@@ -1167,6 +1167,46 @@ async def test_make_apply_guardrail_request_scopes_api_key_to_bedrock_provider(
     )
 
 
+def test_bedrock_api_key_rejects_caller_provider_spoofing(monkeypatch: pytest.MonkeyPatch) -> None:
+    from litellm.proxy import proxy_server
+
+    router = MagicMock()
+    router.get_model_list.return_value = [
+        {"litellm_params": {"model": "gpt-4o", "custom_llm_provider": "openai"}}
+    ]
+    monkeypatch.setattr(proxy_server, "llm_router", router)
+
+    assert (
+        BedrockGuardrail._get_bedrock_api_key(
+            {
+                "model": "shared-alias",
+                "custom_llm_provider": "bedrock",
+                "api_key": "bedrock-key",
+            }
+        )
+        is None
+    )
+
+
+def test_bedrock_api_key_accepts_alias_with_only_bedrock_deployments(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    from litellm.proxy import proxy_server
+
+    router = MagicMock()
+    router.get_model_list.return_value = [
+        {"litellm_params": {"model": "amazon.nova-lite-v1:0", "custom_llm_provider": "bedrock"}}
+    ]
+    monkeypatch.setattr(proxy_server, "llm_router", router)
+
+    assert (
+        BedrockGuardrail._get_bedrock_api_key(
+            {"model": "bedrock-alias", "api_key": "bedrock-key"}
+        )
+        == "bedrock-key"
+    )
+
+
 @pytest.mark.asyncio
 async def test_bedrock_apply_guardrail_response_uses_OUTPUT_source():
     """input_type='response' must call Bedrock with source=OUTPUT and assistant content.