diff --git a/build/cmake/tests/gui/CMakeLists.txt b/build/cmake/tests/gui/CMakeLists.txt
index e2a988ece1..7ff31daf37 100644
--- a/build/cmake/tests/gui/CMakeLists.txt
+++ b/build/cmake/tests/gui/CMakeLists.txt
@@ -191,6 +191,8 @@ set(TEST_GUI_DATA
     image/toucan_dis_240.png
     image/toucan_grey.png
     image/toucan_mono_255_255_255.png
+    image/width-times-height-overflow.bmp
+    image/width_height_32_bit_overflow.pgm
     intl/ja/internat.mo
     intl/ja/internat.po
     )
diff --git a/src/common/image.cpp b/src/common/image.cpp
index 7df6d86fab..9bb7ca2461 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -156,15 +156,22 @@ bool wxImage::Create( int width, int height, bool clear )
 {
     UnRef();
 
-    m_refData = new wxImageRefData();
-
-    M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
-    if (!M_IMGDATA->m_data)
-    {
-        UnRef();
+    if (width <= 0 || height <= 0)
         return false;
-    }
 
+    const unsigned long long size = (unsigned long long)width * height * 3;
+
+    // In theory, 64-bit architectures could handle larger sizes,
+    // but wxImage code is riddled with int-based arithmetic which will overflow
+    if (size > INT_MAX)
+        return false;
+
+    unsigned char* p = (unsigned char*)malloc(size_t(size));
+    if (p == NULL)
+        return false;
+
+    m_refData = new wxImageRefData;
+    M_IMGDATA->m_data = p;
     M_IMGDATA->m_width = width;
     M_IMGDATA->m_height = height;
     M_IMGDATA->m_ok = true;
diff --git a/tests/Makefile.in b/tests/Makefile.in
index 61f8a5ef65..747e4c5f18 100644
--- a/tests/Makefile.in
+++ b/tests/Makefile.in
@@ -565,7 +565,7 @@ data:
 
 data-images: 
 	@mkdir -p image
-	@for f in 8bpp-colorsused-large.bmp 8bpp-colorsused-negative.bmp rle4-delta-320x240.bmp rle8-delta-320x240.bmp rle8-delta-320x240-expected.bmp horse_grey.bmp horse_grey_flipped.bmp horse_rle4.bmp horse_rle4_flipped.bmp horse_rle8.bmp horse_rle8_flipped.bmp horse_bicubic_50x50.png horse_bicubic_100x100.png horse_bicubic_150x150.png horse_bicubic_300x300.png horse_bilinear_50x50.png horse_bilinear_100x100.png horse_bilinear_150x150.png horse_bilinear_300x300.png horse_box_average_50x50.png horse_box_average_100x100.png horse_box_average_150x150.png horse_box_average_300x300.png cross_bicubic_256x256.png cross_bilinear_256x256.png cross_box_average_256x256.png cross_nearest_neighb_256x256.png paste_input_background.png paste_input_black.png paste_input_overlay_transparent_border_opaque_square.png paste_input_overlay_transparent_border_semitransparent_circle.png paste_input_overlay_transparent_border_semitransparent_square.png paste_result_background_plus_circle_plus_square.png paste_result_background_plus_overlay_transparent_border_opaque_square.png paste_result_background_plus_overlay_transparent_border_semitransparent_square.png paste_result_no_background_square_over_circle.png wx.png wx.ico toucan.png toucan_hue_0.538.png toucan_sat_-0.41.png toucan_bright_-0.259.png toucan_hsv_0.538_-0.41_-0.259.png toucan_light_46.png toucan_dis_240.png toucan_grey.png toucan_mono_255_255_255.png; do \
+	@for f in 8bpp-colorsused-large.bmp 8bpp-colorsused-negative.bmp rle4-delta-320x240.bmp rle8-delta-320x240.bmp rle8-delta-320x240-expected.bmp horse_grey.bmp horse_grey_flipped.bmp horse_rle4.bmp horse_rle4_flipped.bmp horse_rle8.bmp horse_rle8_flipped.bmp horse_bicubic_50x50.png horse_bicubic_100x100.png horse_bicubic_150x150.png horse_bicubic_300x300.png horse_bilinear_50x50.png horse_bilinear_100x100.png horse_bilinear_150x150.png horse_bilinear_300x300.png horse_box_average_50x50.png horse_box_average_100x100.png horse_box_average_150x150.png horse_box_average_300x300.png cross_bicubic_256x256.png cross_bilinear_256x256.png cross_box_average_256x256.png cross_nearest_neighb_256x256.png paste_input_background.png paste_input_black.png paste_input_overlay_transparent_border_opaque_square.png paste_input_overlay_transparent_border_semitransparent_circle.png paste_input_overlay_transparent_border_semitransparent_square.png paste_result_background_plus_circle_plus_square.png paste_result_background_plus_overlay_transparent_border_opaque_square.png paste_result_background_plus_overlay_transparent_border_semitransparent_square.png paste_result_no_background_square_over_circle.png wx.png wx.ico toucan.png toucan_hue_0.538.png toucan_sat_-0.41.png toucan_bright_-0.259.png toucan_hsv_0.538_-0.41_-0.259.png toucan_light_46.png toucan_dis_240.png toucan_grey.png toucan_mono_255_255_255.png width-times-height-overflow.bmp width_height_32_bit_overflow.pgm; do \
 	if test ! -f image/$$f -a ! -d image/$$f ; \
 	then x=yep ; \
 	else x=`find $(srcdir)/image/$$f -newer image/$$f -print` ; \
diff --git a/tests/image/image.cpp b/tests/image/image.cpp
index 009e94ca48..5eb923eb34 100644
--- a/tests/image/image.cpp
+++ b/tests/image/image.cpp
@@ -98,7 +98,6 @@ private:
         CPPUNIT_TEST( BMPFlippingAndRLECompression );
         CPPUNIT_TEST( ScaleCompare );
         CPPUNIT_TEST( CreateBitmapFromCursor );
-        CPPUNIT_TEST( MalformedBMP );
     CPPUNIT_TEST_SUITE_END();
 
     void LoadFromSocketStream();
@@ -120,7 +119,6 @@ private:
     void BMPFlippingAndRLECompression();
     void ScaleCompare();
     void CreateBitmapFromCursor();
-    void MalformedBMP();
 
     wxDECLARE_NO_COPY_CLASS(ImageTestCase);
 };
@@ -1528,25 +1526,52 @@ void ImageTestCase::CreateBitmapFromCursor()
 }
 
 // This function assumes that the file is malformed in a way that it cannot
-// be loaded.  If the file is malformed such that wxImage can salvage part
-// of it, then CompareBMPImage should be called instead.
-static void LoadMalformedBMP(const wxString& file)
+// be loaded but that doesn't fail a wxCHECK.
+static void LoadMalformedImage(const wxString& file, wxBitmapType type)
 {
-    wxImage image(file);
-    WX_ASSERT_MESSAGE
-    (
-        ("wxImage::isOk() returned true after loading \"%s\"", file),
-        !image.IsOk()
-    );
+    // If the file doesn't exist, it's a test bug.
+    // (The product code would fail but for the wrong reason.)
+    INFO("Checking that image exists: " << file);
+    REQUIRE(wxFileExists(file));
+
+    // Load the image, expecting a failure.
+    wxImage image;
+    INFO("Loading malformed image: " << file);
+    REQUIRE(!image.LoadFile(file, type));
 }
 
-void ImageTestCase::MalformedBMP()
+// This function assumes that the file is malformed in a way that wxImage
+// fails a wxCHECK when trying to load it.
+static void LoadMalformedImageWithException(const wxString& file,
+                                            wxBitmapType type)
 {
-    LoadMalformedBMP("image/8bpp-colorsused-negative.bmp");
-    LoadMalformedBMP("image/8bpp-colorsused-large.bmp");
+    // If the file doesn't exist, it's a test bug.
+    // (The product code would fail but for the wrong reason.)
+    INFO("Checking that image exists: " << file);
+    REQUIRE(wxFileExists(file));
+
+    wxImage image;
+    INFO("Loading malformed image: " << file);
+#ifdef __WXDEBUG__
+    REQUIRE_THROWS(image.LoadFile(file, type));
+#else
+    REQUIRE(!image.LoadFile(file, type));
+#endif
 }
 
-#endif //wxUSE_IMAGE
+TEST_CASE("wxImage::BMP", "[image][bmp]")
+{
+    SECTION("Load malformed bitmaps")
+    {
+        LoadMalformedImage("image/8bpp-colorsused-negative.bmp",
+                           wxBITMAP_TYPE_BMP);
+        LoadMalformedImage("image/8bpp-colorsused-large.bmp",
+                           wxBITMAP_TYPE_BMP);
+
+        LoadMalformedImageWithException("image/width-times-height-overflow.bmp",
+                                        wxBITMAP_TYPE_BMP);
+    }
+}
 
 TEST_CASE("wxImage::Paste", "[image][paste]")
 {
@@ -2234,6 +2259,20 @@ TEST_CASE("wxImage::XPM", "[image][xpm]")
    CHECK( wxIcon(dummy_xpm).IsOk() );
 }
 
+TEST_CASE("wxImage::PNM", "[image][pnm]")
+{
+#if wxUSE_PNM
+    wxImage::AddHandler(new wxPNMHandler);
+
+    SECTION("width*height*3 overflow")
+    {
+        // wxImage should reject the file as malformed (wxTrac#19326)
+        LoadMalformedImageWithException("image/width_height_32_bit_overflow.pgm",
+                                        wxBITMAP_TYPE_PNM);
+    }
+#endif
+}
+
 TEST_CASE("wxImage::ChangeColours", "[image]")
 {
     wxImage original;
@@ -2298,3 +2337,5 @@ TEST_CASE("wxImage::SizeLimits", "[image]")
 /*
     TODO: add lots of more tests to wxImage functions
 */
+
+#endif //wxUSE_IMAGE
diff --git a/tests/image/width-times-height-overflow.bmp b/tests/image/width-times-height-overflow.bmp
new file mode 100644
index 0000000000..24dd2cdfad
Binary files /dev/null and b/tests/image/width-times-height-overflow.bmp differ
diff --git a/tests/image/width_height_32_bit_overflow.pgm b/tests/image/width_height_32_bit_overflow.pgm
new file mode 100644
index 0000000000..64a726934e
--- /dev/null
+++ b/tests/image/width_height_32_bit_overflow.pgm
@@ -0,0 +1,2395 @@
+P2
+# This is an image in ASCII Portable GrapMap (8 bpp) format.
+# It has a carefully selected width and height so that
+# width * height * 3 overflows a 32-bit integer.
+#
+# It is a regression test for
+#   https://trac.wxwidgets.org/ticket/19326
+#
+# Each line encodes 32 pixels.  The idea is to
+# have enough of an image present to overwrite a buffer
+# that is allocated with this many bytes:
+#   0xFFFFFFFF & (width * height * 3) = 146
+#
+37981 37694
+15
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diff --git a/tests/makefile.gcc b/tests/makefile.gcc
index 90112972ae..e2ba26d653 100644
--- a/tests/makefile.gcc
+++ b/tests/makefile.gcc
@@ -555,7 +555,7 @@ data:
 
 data-images: 
 	if not exist image mkdir image
-	for %%f in (8bpp-colorsused-large.bmp 8bpp-colorsused-negative.bmp rle4-delta-320x240.bmp rle8-delta-320x240.bmp rle8-delta-320x240-expected.bmp horse_grey.bmp horse_grey_flipped.bmp horse_rle4.bmp horse_rle4_flipped.bmp horse_rle8.bmp horse_rle8_flipped.bmp horse_bicubic_50x50.png horse_bicubic_100x100.png horse_bicubic_150x150.png horse_bicubic_300x300.png horse_bilinear_50x50.png horse_bilinear_100x100.png horse_bilinear_150x150.png horse_bilinear_300x300.png horse_box_average_50x50.png horse_box_average_100x100.png horse_box_average_150x150.png horse_box_average_300x300.png cross_bicubic_256x256.png cross_bilinear_256x256.png cross_box_average_256x256.png cross_nearest_neighb_256x256.png paste_input_background.png paste_input_black.png paste_input_overlay_transparent_border_opaque_square.png paste_input_overlay_transparent_border_semitransparent_circle.png paste_input_overlay_transparent_border_semitransparent_square.png paste_result_background_plus_circle_plus_square.png paste_result_background_plus_overlay_transparent_border_opaque_square.png paste_result_background_plus_overlay_transparent_border_semitransparent_square.png paste_result_no_background_square_over_circle.png wx.png wx.ico toucan.png toucan_hue_0.538.png toucan_sat_-0.41.png toucan_bright_-0.259.png toucan_hsv_0.538_-0.41_-0.259.png toucan_light_46.png toucan_dis_240.png toucan_grey.png toucan_mono_255_255_255.png) do if not exist image\%%f copy .\image\%%f image
+	for %%f in (8bpp-colorsused-large.bmp 8bpp-colorsused-negative.bmp rle4-delta-320x240.bmp rle8-delta-320x240.bmp rle8-delta-320x240-expected.bmp horse_grey.bmp horse_grey_flipped.bmp horse_rle4.bmp horse_rle4_flipped.bmp horse_rle8.bmp horse_rle8_flipped.bmp horse_bicubic_50x50.png horse_bicubic_100x100.png horse_bicubic_150x150.png horse_bicubic_300x300.png horse_bilinear_50x50.png horse_bilinear_100x100.png horse_bilinear_150x150.png horse_bilinear_300x300.png horse_box_average_50x50.png horse_box_average_100x100.png horse_box_average_150x150.png horse_box_average_300x300.png cross_bicubic_256x256.png cross_bilinear_256x256.png cross_box_average_256x256.png cross_nearest_neighb_256x256.png paste_input_background.png paste_input_black.png paste_input_overlay_transparent_border_opaque_square.png paste_input_overlay_transparent_border_semitransparent_circle.png paste_input_overlay_transparent_border_semitransparent_square.png paste_result_background_plus_circle_plus_square.png paste_result_background_plus_overlay_transparent_border_opaque_square.png paste_result_background_plus_overlay_transparent_border_semitransparent_square.png paste_result_no_background_square_over_circle.png wx.png wx.ico toucan.png toucan_hue_0.538.png toucan_sat_-0.41.png toucan_bright_-0.259.png toucan_hsv_0.538_-0.41_-0.259.png toucan_light_46.png toucan_dis_240.png toucan_grey.png toucan_mono_255_255_255.png width-times-height-overflow.bmp width_height_32_bit_overflow.pgm) do if not exist image\%%f copy .\image\%%f image
 
 fr: 
 	if not exist $(OBJS)\intl\fr mkdir $(OBJS)\intl\fr
diff --git a/tests/makefile.vc b/tests/makefile.vc
index cc2335b12e..eeab8e73dd 100644
--- a/tests/makefile.vc
+++ b/tests/makefile.vc
@@ -989,7 +989,7 @@ data:
 
 data-images: 
 	if not exist image mkdir image
-	for %f in (8bpp-colorsused-large.bmp 8bpp-colorsused-negative.bmp rle4-delta-320x240.bmp rle8-delta-320x240.bmp rle8-delta-320x240-expected.bmp horse_grey.bmp horse_grey_flipped.bmp horse_rle4.bmp horse_rle4_flipped.bmp horse_rle8.bmp horse_rle8_flipped.bmp horse_bicubic_50x50.png horse_bicubic_100x100.png horse_bicubic_150x150.png horse_bicubic_300x300.png horse_bilinear_50x50.png horse_bilinear_100x100.png horse_bilinear_150x150.png horse_bilinear_300x300.png horse_box_average_50x50.png horse_box_average_100x100.png horse_box_average_150x150.png horse_box_average_300x300.png cross_bicubic_256x256.png cross_bilinear_256x256.png cross_box_average_256x256.png cross_nearest_neighb_256x256.png paste_input_background.png paste_input_black.png paste_input_overlay_transparent_border_opaque_square.png paste_input_overlay_transparent_border_semitransparent_circle.png paste_input_overlay_transparent_border_semitransparent_square.png paste_result_background_plus_circle_plus_square.png paste_result_background_plus_overlay_transparent_border_opaque_square.png paste_result_background_plus_overlay_transparent_border_semitransparent_square.png paste_result_no_background_square_over_circle.png wx.png wx.ico toucan.png toucan_hue_0.538.png toucan_sat_-0.41.png toucan_bright_-0.259.png toucan_hsv_0.538_-0.41_-0.259.png toucan_light_46.png toucan_dis_240.png toucan_grey.png toucan_mono_255_255_255.png) do if not exist image\%f copy .\image\%f image
+	for %f in (8bpp-colorsused-large.bmp 8bpp-colorsused-negative.bmp rle4-delta-320x240.bmp rle8-delta-320x240.bmp rle8-delta-320x240-expected.bmp horse_grey.bmp horse_grey_flipped.bmp horse_rle4.bmp horse_rle4_flipped.bmp horse_rle8.bmp horse_rle8_flipped.bmp horse_bicubic_50x50.png horse_bicubic_100x100.png horse_bicubic_150x150.png horse_bicubic_300x300.png horse_bilinear_50x50.png horse_bilinear_100x100.png horse_bilinear_150x150.png horse_bilinear_300x300.png horse_box_average_50x50.png horse_box_average_100x100.png horse_box_average_150x150.png horse_box_average_300x300.png cross_bicubic_256x256.png cross_bilinear_256x256.png cross_box_average_256x256.png cross_nearest_neighb_256x256.png paste_input_background.png paste_input_black.png paste_input_overlay_transparent_border_opaque_square.png paste_input_overlay_transparent_border_semitransparent_circle.png paste_input_overlay_transparent_border_semitransparent_square.png paste_result_background_plus_circle_plus_square.png paste_result_background_plus_overlay_transparent_border_opaque_square.png paste_result_background_plus_overlay_transparent_border_semitransparent_square.png paste_result_no_background_square_over_circle.png wx.png wx.ico toucan.png toucan_hue_0.538.png toucan_sat_-0.41.png toucan_bright_-0.259.png toucan_hsv_0.538_-0.41_-0.259.png toucan_light_46.png toucan_dis_240.png toucan_grey.png toucan_mono_255_255_255.png width-times-height-overflow.bmp width_height_32_bit_overflow.pgm) do if not exist image\%f copy .\image\%f image
 
 fr: 
 	if not exist $(OBJS)\intl\fr mkdir $(OBJS)\intl\fr
diff --git a/tests/test.bkl b/tests/test.bkl
index 136af6fd86..89ef76cb0d 100644
--- a/tests/test.bkl
+++ b/tests/test.bkl
@@ -401,6 +401,9 @@
             toucan_dis_240.png
             toucan_grey.png
             toucan_mono_255_255_255.png
+
+            width-times-height-overflow.bmp
+            width_height_32_bit_overflow.pgm
         </files>
     </wx-data>