diff --git a/third_party/blink/renderer/bindings/core/v8/native_value_traits_buffer_sources.cc b/third_party/blink/renderer/bindings/core/v8/native_value_traits_buffer_sources.cc
index b8bc3865f0eb43..4a4d5687b989a0 100644
--- a/third_party/blink/renderer/bindings/core/v8/native_value_traits_buffer_sources.cc
+++ b/third_party/blink/renderer/bindings/core/v8/native_value_traits_buffer_sources.cc
@@ -350,6 +350,13 @@ DOMViewType* ToDOMViewType(v8::Isolate* isolate, v8::Local<v8::Value> value) {
   v8::Local<typename Trait::V8ViewType> v8_view =
       value.As<typename Trait::V8ViewType>();
   if (auto* blink_view = ToScriptWrappable<DOMViewType>(isolate, v8_view)) {
+    if constexpr (!allow_shared) {
+      // The cached Blink wrapper may have been created via an [AllowShared]
+      // path; re-check sharedness so the NotShared<T> recipe still rejects it.
+      if (blink_view->IsShared()) [[unlikely]] {
+        return nullptr;
+      }
+    }
     return blink_view;
   }
 
@@ -385,6 +392,13 @@ DOMArrayBufferView* ToDOMArrayBufferView(v8::Isolate* isolate,
   v8::Local<v8::ArrayBufferView> v8_view = value.As<v8::ArrayBufferView>();
   if (auto* blink_view =
           ToScriptWrappable<DOMArrayBufferView>(isolate, v8_view)) {
+    if constexpr (!allow_shared) {
+      // The cached Blink wrapper may have been created via an [AllowShared]
+      // path; re-check sharedness so the NotShared<T> recipe still rejects it.
+      if (blink_view->IsShared()) [[unlikely]] {
+        return nullptr;
+      }
+    }
     return blink_view;
   }