diff --git a/onnxruntime/core/optimizer/skip_layer_norm_fusion.cc b/onnxruntime/core/optimizer/skip_layer_norm_fusion.cc
index 3727ac0918115..2541b4870486d 100644
--- a/onnxruntime/core/optimizer/skip_layer_norm_fusion.cc
+++ b/onnxruntime/core/optimizer/skip_layer_norm_fusion.cc
@@ -199,7 +199,11 @@ Status SkipLayerNormFusion::ApplyImpl(Graph& graph, bool& modified, int graph_le
     Format matched_format = Format::None;
 
     // Format 1
-    std::vector<graph_utils::EdgeEndToMatch> format1_parent_path{
+    // The matcher paths are compile-time constants, so make them function-local `static const`:
+    // built once (not per node iteration), and their destructors run at program exit rather than
+    // inlined into ApplyImpl, which sidesteps a GCC 15 -Wfree-nonheap-object false positive on the
+    // vector's destructor.
+    static const std::vector<graph_utils::EdgeEndToMatch> format1_parent_path{
         {0, 0, "Add", {7, 13, 14}, kOnnxDomain},
         {0, 0, "Add", {7, 13, 14}, kOnnxDomain}};
 
@@ -218,7 +222,7 @@ Status SkipLayerNormFusion::ApplyImpl(Graph& graph, bool& modified, int graph_le
 
     if (matched_format == Format::None) {
       // Format 2
-      std::vector<graph_utils::EdgeEndToMatch> format2_parent_path{
+      static const std::vector<graph_utils::EdgeEndToMatch> format2_parent_path{
           {0, 0, "Add", {7, 13, 14}, kOnnxDomain},
           {0, 1, "Add", {7, 13, 14}, kOnnxDomain}};
 
@@ -237,7 +241,7 @@ Status SkipLayerNormFusion::ApplyImpl(Graph& graph, bool& modified, int graph_le
 
     if (matched_format == Format::None) {
       // Format 3
-      std::vector<graph_utils::EdgeEndToMatch> format3_parent_path{
+      static const std::vector<graph_utils::EdgeEndToMatch> format3_parent_path{
           {0, 0, "Add", {7, 13, 14}, kOnnxDomain}};
 
       if (graph_utils::FindPath(ln_node, true, format3_parent_path, edges, logger)) {
diff --git a/onnxruntime/test/providers/cpu/ml/zipmap_test.cc b/onnxruntime/test/providers/cpu/ml/zipmap_test.cc
index e2e8ced73e565..d154a143a34ec 100644
--- a/onnxruntime/test/providers/cpu/ml/zipmap_test.cc
+++ b/onnxruntime/test/providers/cpu/ml/zipmap_test.cc
@@ -7,10 +7,14 @@ using namespace std;
 namespace onnxruntime {
 namespace test {
 template <typename T>
-void TestHelper(const std::vector<T>& classes,
+void TestHelper(std::initializer_list<T> classes_init,
                 const std::string& type,
                 const vector<int64_t>& input_dims,
                 OpTester::ExpectResult expect_result = OpTester::ExpectResult::kExpectSuccess) {
+  // Materialize the class list inside the helper rather than binding a braced std::vector temporary
+  // at each call site: keeps the vector's construction/destruction out of the inlined TEST body,
+  // where GCC 15 emits a -Wfree-nonheap-object false positive on the vector's destructor.
+  const std::vector<T> classes(classes_init);
   OpTester test("ZipMap", 1, onnxruntime::kMLDomain);
 
   std::vector<float> input{1.f, 0.f, 3.f, 44.f, 23.f, 11.3f};
diff --git a/onnxruntime/test/unittest_util/conversion.h b/onnxruntime/test/unittest_util/conversion.h
index b0f0663f33dd7..5fa9860576619 100644
--- a/onnxruntime/test/unittest_util/conversion.h
+++ b/onnxruntime/test/unittest_util/conversion.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <algorithm>
 #include <cstdint>
 
 #include "core/common/float16.h"
@@ -10,29 +11,28 @@
 
 namespace onnxruntime {
 namespace test {
+// These converters use std::transform rather than an Eigen Map cast-assignment. The Eigen path
+// vectorizes to a 16-wide _mm512_loadu_ps under -march=native, which GCC 15 mis-flags with a
+// -Warray-bounds false positive when the helper is inlined into callers that pass small fixed-size
+// buffers (it assumes the guarded packet load runs at input_size < 16). The element-wise transforms
+// keep identical conversion semantics (Eigen::half round-to-nearest for float<->half; static_cast
+// for the integer casts) without the vectorized load.
 inline void ConvertFloatToMLFloat16(const float* f_datat, MLFloat16* h_data, size_t input_size) {
-  auto in_vector = ConstEigenVectorMap<float>(f_datat, input_size);
-  auto output_vector = EigenVectorMap<Eigen::half>(static_cast<Eigen::half*>(static_cast<void*>(h_data)), input_size);
-  output_vector = in_vector.template cast<Eigen::half>();
+  auto* h = static_cast<Eigen::half*>(static_cast<void*>(h_data));
+  std::transform(f_datat, f_datat + input_size, h, [](float f) { return static_cast<Eigen::half>(f); });
 }
 
 inline void ConvertFloatToUint8_t(const float* f_datat, uint8_t* u8_data, size_t input_size) {
-  auto in_vector = ConstEigenVectorMap<float>(f_datat, input_size);
-  auto output_vector = EigenVectorMap<uint8_t>(static_cast<uint8_t*>(static_cast<void*>(u8_data)), input_size);
-  output_vector = in_vector.template cast<uint8_t>();
+  std::transform(f_datat, f_datat + input_size, u8_data, [](float f) { return static_cast<uint8_t>(f); });
 }
 
 inline void ConvertFloatToInt8_t(const float* f_datat, int8_t* i8_data, size_t input_size) {
-  auto in_vector = ConstEigenVectorMap<float>(f_datat, input_size);
-  auto output_vector = EigenVectorMap<int8_t>(static_cast<int8_t*>(static_cast<void*>(i8_data)), input_size);
-  output_vector = in_vector.template cast<int8_t>();
+  std::transform(f_datat, f_datat + input_size, i8_data, [](float f) { return static_cast<int8_t>(f); });
 }
 
 inline void ConvertMLFloat16ToFloat(const MLFloat16* h_data, float* f_data, size_t input_size) {
-  auto in_vector =
-      ConstEigenVectorMap<Eigen::half>(static_cast<const Eigen::half*>(static_cast<const void*>(h_data)), input_size);
-  auto output_vector = EigenVectorMap<float>(f_data, input_size);
-  output_vector = in_vector.template cast<float>();
+  const auto* h = static_cast<const Eigen::half*>(static_cast<const void*>(h_data));
+  std::transform(h, h + input_size, f_data, [](Eigen::half h) { return static_cast<float>(h); });
 }
 
 inline std::vector<MLFloat16> FloatsToMLFloat16s(const std::vector<float>& f) {