diff --git a/python/openai/openai_frontend/engine/utils/triton.py b/python/openai/openai_frontend/engine/utils/triton.py
index 3b0f04e3d9..636e58435d 100644
--- a/python/openai/openai_frontend/engine/utils/triton.py
+++ b/python/openai/openai_frontend/engine/utils/triton.py
@@ -28,6 +28,7 @@
 import os
 import re
 from dataclasses import asdict, dataclass, field
+from pathlib import Path
 from typing import Iterable, List, Optional, Union
 
 import numpy as np
@@ -356,13 +357,24 @@ def _get_guided_json_from_tool(
 def _get_vllm_lora_names(
     model_repository: str | list[str], model_name: str, model_version: int
 ) -> None | List[str]:
+    if (
+        len(model_name) == 0
+        or model_name.isspace()
+        or "/" in model_name
+        or "\\" in model_name
+    ):
+        raise ValueError(
+            f"Invalid model name: '{model_name}'. Model names must be valid file-system-path segment names."
+        )
     lora_names = []
     repo_paths = model_repository
     if isinstance(repo_paths, str):
         repo_paths = [repo_paths]
     for repo_path in repo_paths:
         model_path = os.path.join(repo_path, model_name)
-        if os.path.normpath(model_path) != model_path:
+        if (not Path(model_path).is_relative_to(repo_path)) or (
+            os.path.normpath(model_path) != model_path
+        ):
             raise ValueError(
                 f"Invalid model name: '{model_name}'. Model names must be valid file-system-path segment names."
             )
diff --git a/python/openai/tests/test_lora.py b/python/openai/tests/test_lora.py
index 4a5ff10361..550273cf52 100644
--- a/python/openai/tests/test_lora.py
+++ b/python/openai/tests/test_lora.py
@@ -29,12 +29,50 @@
 import shutil
 import unittest
 
+import pytest
 from huggingface_hub import snapshot_download
 from openai import BadRequestError, NotFoundError
+from openai_frontend.engine.utils.triton import (
+    _get_vllm_lora_names as get_vllm_lora_names,
+)
 
 from .utils import OpenAIServer
 
 
+@pytest.mark.parametrize(
+    "model_repository,model_name,expect_error",
+    [
+        ("openai_model_repository", "", True),  # Empty string as model name.
+        ("openai_model_repository", "     ", True),  # Whitespace-only model name.
+        ("openai_model_repository", "invalid/path", True),
+        ("openai_model_repository", "invalid\\path", True),
+        ("openai_model_repository", "../outside/repo", True),
+        ("openai_model_repository", "../test_models/identity_py", True),
+        ("test_models", "../test_models/identity_py", True),
+        ("test_models", "identity_py", False),
+        ("test_models", "mock_llm", False),
+    ],
+)
+def test_get_vllm_lora_name(model_repository: str, model_name: str, expect_error: bool):
+    try:
+        get_vllm_lora_names(model_repository, model_name, 1)
+    except ValueError as e:
+        if expect_error:
+            assert (
+                f"Invalid model name: '{model_name}'. Model names must be valid file-system-path segment names."
+                == str(e)
+            )
+        else:
+            raise pytest.fail(
+                f"(model_repository='{model_repository}', model_name='{model_name}') raised ValueError unexpectedly: {e}"
+            )
+    else:
+        if expect_error:
+            raise pytest.fail(
+                f"(model_repository='{model_repository}', model_name='{model_name}') did not raise ValueError as expected."
+            )
+
+
 def is_vllm_installed():
     try:
         import vllm as _