diff --git a/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs b/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs
index 4a3ef9b95..37da32d76 100644
--- a/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs
+++ b/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs
@@ -31,6 +31,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
                 TestImages.Jpeg.Issues.InvalidAPP0721,
                 TestImages.Jpeg.Issues.ExifGetString750Load,
                 TestImages.Jpeg.Issues.ExifGetString750Transform,
+                TestImages.Jpeg.Issues.BadSubSampling1076,
 
                 // LibJpeg can open this despite the invalid density units.
                 TestImages.Jpeg.Issues.Fuzz.ArgumentOutOfRangeException825B,
@@ -38,6 +39,9 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
                 // LibJpeg can open this despite incorrect colorspace metadata.
                 TestImages.Jpeg.Issues.IncorrectColorspace855,
 
+                // LibJpeg can open this despite the invalid subsampling units.
+                TestImages.Jpeg.Issues.Fuzz.IndexOutOfRangeException824C,
+
                 // High depth images
                 TestImages.Jpeg.Baseline.Testorig12bit,
             };
@@ -71,7 +75,6 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             TestImages.Jpeg.Issues.Fuzz.NullReferenceException823,
             TestImages.Jpeg.Issues.Fuzz.IndexOutOfRangeException824A,
             TestImages.Jpeg.Issues.Fuzz.IndexOutOfRangeException824B,
-            TestImages.Jpeg.Issues.Fuzz.IndexOutOfRangeException824C,
             TestImages.Jpeg.Issues.Fuzz.IndexOutOfRangeException824D,
             TestImages.Jpeg.Issues.Fuzz.IndexOutOfRangeException824E,
             TestImages.Jpeg.Issues.Fuzz.IndexOutOfRangeException824F,
diff --git a/tests/ImageSharp.Tests/TestImages.cs b/tests/ImageSharp.Tests/TestImages.cs
index ada077496..f5cdb29b6 100644
--- a/tests/ImageSharp.Tests/TestImages.cs
+++ b/tests/ImageSharp.Tests/TestImages.cs
@@ -192,6 +192,7 @@ namespace SixLabors.ImageSharp.Tests
                 public const string IncorrectColorspace855 = "Jpg/issues/issue855-incorrect-colorspace.jpg";
                 public const string IncorrectResize1006 = "Jpg/issues/issue1006-incorrect-resize.jpg";
                 public const string ExifResize1049 = "Jpg/issues/issue1049-exif-resize.jpg";
+                public const string BadSubSampling1076 = "Jpg/issues/issue-1076-invalid-subsampling.jpg";
 
                 public static class Fuzz
                 {
diff --git a/tests/Images/External b/tests/Images/External
index d8ea82085..b47190bd5 160000
--- a/tests/Images/External
+++ b/tests/Images/External
@@ -1 +1 @@
-Subproject commit d8ea82085ac39a6aa6ca8e0806a9518d3a7d3337
+Subproject commit b47190bd5cd450110f3849962512b918d2596ecf
diff --git a/tests/Images/Input/Jpg/issues/issue-1076-invalid-subsampling.jpg b/tests/Images/Input/Jpg/issues/issue-1076-invalid-subsampling.jpg
new file mode 100644
index 000000000..94729a2e9
Binary files /dev/null and b/tests/Images/Input/Jpg/issues/issue-1076-invalid-subsampling.jpg differ