diff --git a/test/conformance/enqueue/urEnqueueMemBufferCopyRect.cpp b/test/conformance/enqueue/urEnqueueMemBufferCopyRect.cpp
index cd391d139d..f330503211 100644
--- a/test/conformance/enqueue/urEnqueueMemBufferCopyRect.cpp
+++ b/test/conformance/enqueue/urEnqueueMemBufferCopyRect.cpp
@@ -261,3 +261,16 @@ TEST_F(urEnqueueMemBufferCopyRectMultiDeviceTest, CopyRectReadDifferentQueues) {
 
     EXPECT_SUCCESS(urMemRelease(dst_buffer));
 }
+
+TEST_P(urEnqueueMemBufferCopyRectTest, InvalidSize) {
+    // out-of-bounds access with potential overflow
+    ur_rect_region_t src_region{size, 1, 1};
+    ur_rect_offset_t src_origin{std::numeric_limits<uint64_t>::max(), 1, 1};
+    ur_rect_offset_t dst_origin{0, 0, 0};
+
+    ASSERT_EQ_RESULT(urEnqueueMemBufferCopyRect(queue, src_buffer, dst_buffer,
+                                                src_origin, dst_origin,
+                                                src_region, size, size, size,
+                                                size, 0, nullptr, nullptr),
+                     UR_RESULT_ERROR_INVALID_SIZE);
+}
diff --git a/test/conformance/enqueue/urEnqueueMemBufferReadRect.cpp b/test/conformance/enqueue/urEnqueueMemBufferReadRect.cpp
index 5f505b2870..ae0cc05332 100644
--- a/test/conformance/enqueue/urEnqueueMemBufferReadRect.cpp
+++ b/test/conformance/enqueue/urEnqueueMemBufferReadRect.cpp
@@ -203,3 +203,19 @@ TEST_F(urEnqueueMemBufferReadRectMultiDeviceTest, WriteReadDifferentQueues) {
             << "Result on queue " << i << " did not match!";
     }
 }
+
+TEST_P(urEnqueueMemBufferReadRectTest, InvalidSize) {
+    std::vector<uint32_t> dst(count);
+    // out-of-bounds access with potential overflow
+    ur_rect_region_t region{size, 1, 1};
+    ur_rect_offset_t buffer_offset{std::numeric_limits<uint64_t>::max(), 1, 1};
+    // Creating an overflow in host_offsets leads to a crash because
+    // the function doesn't do bounds checking of host buffers.
+    ur_rect_offset_t host_offset{0, 0, 0};
+
+    ASSERT_EQ_RESULT(
+        urEnqueueMemBufferReadRect(queue, buffer, true, buffer_offset,
+                                   host_offset, region, size, size, size, size,
+                                   dst.data(), 0, nullptr, nullptr),
+        UR_RESULT_ERROR_INVALID_SIZE);
+}
diff --git a/test/conformance/enqueue/urEnqueueMemBufferWriteRect.cpp b/test/conformance/enqueue/urEnqueueMemBufferWriteRect.cpp
index 895d554e50..e41991e727 100644
--- a/test/conformance/enqueue/urEnqueueMemBufferWriteRect.cpp
+++ b/test/conformance/enqueue/urEnqueueMemBufferWriteRect.cpp
@@ -184,3 +184,21 @@ TEST_P(urEnqueueMemBufferWriteRectTest, InvalidNullPtrEventWaitList) {
                                     src.data(), 0, &validEvent, nullptr),
         UR_RESULT_ERROR_INVALID_EVENT_WAIT_LIST);
 }
+
+TEST_P(urEnqueueMemBufferWriteRectTest, InvalidSize) {
+    std::vector<uint32_t> src(count);
+    std::fill(src.begin(), src.end(), 1);
+
+    // out-of-bounds access with potential overflow
+    ur_rect_region_t region{size, 1, 1};
+    ur_rect_offset_t buffer_offset{std::numeric_limits<uint64_t>::max(), 1, 1};
+    // Creating an overflow in host_offsets leads to a crash because
+    // the function doesn't do bounds checking of host buffers.
+    ur_rect_offset_t host_offset{0, 0, 0};
+
+    ASSERT_EQ_RESULT(
+        urEnqueueMemBufferWriteRect(queue, buffer, true, buffer_offset,
+                                    host_offset, region, size, size, size, size,
+                                    src.data(), 0, nullptr, nullptr),
+        UR_RESULT_ERROR_INVALID_SIZE);
+}