diff --git a/csharp/test/Microsoft.ML.OnnxRuntime.EndToEndTests.Mobile/EndToEndTests.Mobile.Automation/Tests.cs b/csharp/test/Microsoft.ML.OnnxRuntime.EndToEndTests.Mobile/EndToEndTests.Mobile.Automation/Tests.cs
index c28830ec72157..6e6190b8227b8 100644
--- a/csharp/test/Microsoft.ML.OnnxRuntime.EndToEndTests.Mobile/EndToEndTests.Mobile.Automation/Tests.cs
+++ b/csharp/test/Microsoft.ML.OnnxRuntime.EndToEndTests.Mobile/EndToEndTests.Mobile.Automation/Tests.cs
@@ -40,10 +40,12 @@ public void RunPlatformUnitTest()
             var serializedResultSummary = _app.Invoke(_getResultsBackdoorMethodName)?.ToString();
             Assert.IsNotEmpty(serializedResultSummary, "Test results were not returned");
 
+            // Fix security issue (overflow with too much nesting): GHSA-5crp-9r3c-p9vr
+            JsonConvert.DefaultSettings = () => new JsonSerializerSettings { MaxDepth = 128 };
             var testSummary = JsonConvert.DeserializeObject<TestResultSummary>(serializedResultSummary);
             Assert.AreEqual(testSummary.Failed, 0, $"{testSummary.Failed} tests failed");
 
             _app.Screenshot("Post-testing");
         }
     }
-}
\ No newline at end of file
+}
diff --git a/csharp/test/Microsoft.ML.OnnxRuntime.Tests.Devices/TestResultProcessor.cs b/csharp/test/Microsoft.ML.OnnxRuntime.Tests.Devices/TestResultProcessor.cs
index 8419d261e4a41..625cc2c54055c 100644
--- a/csharp/test/Microsoft.ML.OnnxRuntime.Tests.Devices/TestResultProcessor.cs
+++ b/csharp/test/Microsoft.ML.OnnxRuntime.Tests.Devices/TestResultProcessor.cs
@@ -45,8 +45,9 @@ public TestResultSummary GetResults()
         public string GetSerializedResults()
         {
             var resultSummary = GetResults();
+	    JsonConvert.DefaultSettings = () => new JsonSerializerSettings { MaxDepth = 128 };
             var serializedResultSummary = JsonConvert.SerializeObject(resultSummary, Formatting.Indented);
             return serializedResultSummary;
         }
     }
-}
\ No newline at end of file
+}