diff --git a/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs b/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs
index 539ab73195..3c98d5be72 100644
--- a/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs
+++ b/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Images.cs
@@ -38,6 +38,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
                 TestImages.Jpeg.Issues.NoEoiProgressive517,
                 TestImages.Jpeg.Issues.BadRstProgressive518,
                 TestImages.Jpeg.Issues.MissingFF00ProgressiveBedroom159,
+                TestImages.Jpeg.Issues.DhtHasWrongLength624,
             };
 
         /// <summary>
diff --git a/tests/ImageSharp.Tests/TestImages.cs b/tests/ImageSharp.Tests/TestImages.cs
index 6d3a76e75f..b0bdad8e5c 100644
--- a/tests/ImageSharp.Tests/TestImages.cs
+++ b/tests/ImageSharp.Tests/TestImages.cs
@@ -144,6 +144,7 @@ namespace SixLabors.ImageSharp.Tests
                 public const string NoEoiProgressive517 = "Jpg/issues/Issue517-No-EOI-Progressive.jpg";
                 public const string BadRstProgressive518 = "Jpg/issues/Issue518-Bad-RST-Progressive.jpg";
                 public const string InvalidCast520 = "Jpg/issues/Issue520-InvalidCast.jpg";
+                public const string DhtHasWrongLength624 = "Jpg/issues/Issue624-DhtHasWrongLength-Progressive-N.jpg";
             }
 
             public static readonly string[] All = Baseline.All.Concat(Progressive.All).ToArray();
diff --git a/tests/Images/External b/tests/Images/External
index d9d93bbdd1..98fb7e2e4d 160000
--- a/tests/Images/External
+++ b/tests/Images/External
@@ -1 +1 @@
-Subproject commit d9d93bbdd18dd7b818c0d19cc8f967be98045d3c
+Subproject commit 98fb7e2e4d5935b1c733bd2b206b6145b71ef378
diff --git a/tests/Images/Input/Jpg/issues/Issue624-DhtHasWrongLength-Progressive-N.jpg b/tests/Images/Input/Jpg/issues/Issue624-DhtHasWrongLength-Progressive-N.jpg
new file mode 100644
index 0000000000..20a50fba9b
--- /dev/null
+++ b/tests/Images/Input/Jpg/issues/Issue624-DhtHasWrongLength-Progressive-N.jpg
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:da574d176b964eba84b5decb1e88a35d425e09975e0bc0ca73e485604179868f
+size 30441