diff --git a/CMakeLists.txt b/CMakeLists.txt
index a9c4e185df..43e70bd539 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -559,7 +559,17 @@ list(APPEND THIRD_PARTY_LIBRARIES NRLib)
 # ##############################################################################
 
 add_definitions(-DOPENZGY_STATIC)
+
+# Suppress CMake deprecation warnings from openzgy/zfp's old CMakeLists.txt
+set(CMAKE_WARN_DEPRECATED
+    OFF
+    CACHE BOOL "" FORCE
+)
 add_subdirectory(ThirdParty/openzgy)
+set(CMAKE_WARN_DEPRECATED
+    ON
+    CACHE BOOL "" FORCE
+)
 
 list(APPEND THIRD_PARTY_LIBRARIES openzgy)
 set_property(TARGET zfp PROPERTY FOLDER "Thirdparty")
@@ -706,8 +716,24 @@ list(APPEND THIRD_PARTY_LIBRARIES FastFloat::fast_float spdlog::spdlog)
 find_package(Arrow CONFIG REQUIRED)
 if(MSVC)
   list(APPEND THIRD_PARTY_LIBRARIES Arrow::arrow_shared)
+  # Treat Arrow headers as system headers to suppress warnings from third-party
+  # code
+  set_target_properties(
+    Arrow::arrow_shared
+    PROPERTIES
+      INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
+      $<TARGET_PROPERTY:Arrow::arrow_shared,INTERFACE_INCLUDE_DIRECTORIES>
+  )
 else()
   list(APPEND THIRD_PARTY_LIBRARIES Arrow::arrow_static)
+  # Treat Arrow headers as system headers to suppress warnings from third-party
+  # code
+  set_target_properties(
+    Arrow::arrow_static
+    PROPERTIES
+      INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
+      $<TARGET_PROPERTY:Arrow::arrow_static,INTERFACE_INCLUDE_DIRECTORIES>
+  )
 endif()
 
 # ##############################################################################
@@ -716,8 +742,24 @@ endif()
 find_package(Parquet CONFIG REQUIRED)
 if(MSVC)
   list(APPEND THIRD_PARTY_LIBRARIES Parquet::parquet_shared)
+  # Treat Parquet headers as system headers to suppress warnings from
+  # third-party code
+  set_target_properties(
+    Parquet::parquet_shared
+    PROPERTIES
+      INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
+      $<TARGET_PROPERTY:Parquet::parquet_shared,INTERFACE_INCLUDE_DIRECTORIES>
+  )
 else()
   list(APPEND THIRD_PARTY_LIBRARIES Parquet::parquet_static)
+  # Treat Parquet headers as system headers to suppress warnings from
+  # third-party code
+  set_target_properties(
+    Parquet::parquet_static
+    PROPERTIES
+      INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
+      $<TARGET_PROPERTY:Parquet::parquet_static,INTERFACE_INCLUDE_DIRECTORIES>
+  )
 endif()
 
 # ##############################################################################
diff --git a/Fwk/AppFwk/cafUserInterface/cafPdmUiLineEditor.cpp b/Fwk/AppFwk/cafUserInterface/cafPdmUiLineEditor.cpp
index 4740335478..42a5cf8b9a 100644
--- a/Fwk/AppFwk/cafUserInterface/cafPdmUiLineEditor.cpp
+++ b/Fwk/AppFwk/cafUserInterface/cafPdmUiLineEditor.cpp
@@ -92,9 +92,9 @@ QWidget* PdmUiLineEditor::createEditorWidget( QWidget* parent )
     {
         if ( !uiFieldHandle ) return false;
 
-        if ( uiFieldHandle->fieldHandle() )
+        if ( auto fieldHandle = uiFieldHandle->fieldHandle() )
         {
-            const std::type_info& typeInfo = typeid( *uiFieldHandle->fieldHandle() );
+            const std::type_info& typeInfo = typeid( *fieldHandle );
             QString               typeName = QString( typeInfo.name() );
 
             return typeName.contains( "optional", Qt::CaseInsensitive );
diff --git a/tooling/sanitizers/asan_suppressions.txt b/tooling/sanitizers/asan_suppressions.txt
new file mode 100644
index 0000000000..b4d7f19cbb
--- /dev/null
+++ b/tooling/sanitizers/asan_suppressions.txt
@@ -0,0 +1,39 @@
+# ASan Leak Suppression File for ResInsight
+# This file suppresses known leaks in third-party libraries that are not part of ResInsight
+#
+# System Information:
+#   OS: Ubuntu 24.04.2 LTS
+#   Kernel: Linux 6.6.87.2-microsoft-standard-WSL2
+#   Compiler: Ubuntu clang version 19.1.1 (1ubuntu1~24.04.2)
+#   Generated: 2025-10-17
+#
+# Usage:
+# Set the LSAN_OPTIONS environment variable before running tests or the application:
+#   export LSAN_OPTIONS=suppressions=/home/builder/gitroot/ResInsight/tooling/sanitizers/asan_suppressions.txt
+#
+# Or run directly with:
+#   LSAN_OPTIONS=suppressions=/home/builder/gitroot/ResInsight/tooling/sanitizers/asan_suppressions.txt ./build/clang/ResInsight
+#
+# For CMake/CTest:
+#   LSAN_OPTIONS=suppressions=/home/builder/gitroot/ResInsight/tooling/sanitizers/asan_suppressions.txt ctest
+
+# Qt Wayland platform plugin - known leak in wp_viewporter initialization
+leak:libwayland-client.so
+leak:libQt6WaylandClient.so
+
+# Wayland proxy marshalling functions
+leak:wl_proxy_marshal_array_flags
+leak:wl_proxy_marshal_constructor_versioned
+
+# Dynamic library loading leaks during initialization
+leak:call_init
+leak:_dl_init
+leak:dl_open_worker
+leak:_dl_open
+leak:dlopen
+
+# Aligned memory allocation leaks from unknown modules (likely third-party libraries)
+leak:aligned_alloc
+
+# pthread condition variable leaks from system libraries
+leak:pthread_cond_broadcast