diff --git a/Tests/images/ultrahdr.jpg b/Tests/images/ultrahdr.jpg
new file mode 100644
index 00000000000..34f615b61aa
Binary files /dev/null and b/Tests/images/ultrahdr.jpg differ
diff --git a/Tests/test_file_mpo.py b/Tests/test_file_mpo.py
index a5018870058..39b9c60b756 100644
--- a/Tests/test_file_mpo.py
+++ b/Tests/test_file_mpo.py
@@ -226,6 +226,11 @@ def test_eoferror() -> None:
         im.seek(n_frames - 1)
 
 
+def test_ultra_hdr() -> None:
+    with Image.open("Tests/images/ultrahdr.jpg") as im:
+        assert im.format == "JPEG"
+
+
 @pytest.mark.parametrize("test_file", test_files)
 def test_image_grab(test_file: str) -> None:
     with Image.open(test_file) as im:
diff --git a/src/PIL/JpegImagePlugin.py b/src/PIL/JpegImagePlugin.py
index 9d6811cb759..b7d0d24f242 100644
--- a/src/PIL/JpegImagePlugin.py
+++ b/src/PIL/JpegImagePlugin.py
@@ -831,6 +831,10 @@ def jpeg_factory(fp=None, filename=None):
     try:
         mpheader = im._getmp()
         if mpheader[45057] > 1:
+            for segment, content in im.applist:
+                if segment == "APP1" and b' hdrgm:Version="' in content:
+                    # Ultra HDR images are not yet supported
+                    return im
             # It's actually an MPO
             from .MpoImagePlugin import MpoImageFile