fix: allow 50 MP smartphone photos in bulk image upload

NetBox sets Pillow's MAX_IMAGE_PIXELS to 25 MP, so Pillow rejects images
above 50 MP as decompression bombs. Raise the limit to 100 MP while the
bulk upload is processed and surface the underlying Pillow error.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -541,6 +541,12 @@ Anzeigename bleibt der jeweilige ursprüngliche Dateiname erhalten. Benötigt
 werden weiterhin die NetBox-Berechtigung zum Hinzufügen von Bildanhängen und
 eine Leseberechtigung für das Zielobjekt.
 
+NetBox begrenzt Pillow global auf 25 Megapixel und lehnt Bilder ab 50
+Megapixeln ab. Damit aktuelle 50-MP-Smartphone-Fotos (z. B. Google Pixel,
+8160×6144) hochgeladen werden können, hebt der Mehrfach-Upload dieses Limit
+während der Verarbeitung auf 100 Megapixel an. Wird ein Bild abgelehnt, zeigt
+das Formular zusätzlich die genaue Fehlermeldung von Pillow an.
+
 ### Module mehrfach einbauen
 
 Unter **Plugins > NetBox Utilities > Module mehrfach einbauen** kann ein

netbox_utilities/__init__.py

@@ -1,6 +1,6 @@
 from netbox.plugins import PluginConfig, get_plugin_config
 
-__version__ = "0.14.0"
+__version__ = "0.14.1"
 
 
 class NetBoxUtilitiesConfig(PluginConfig):

netbox_utilities/views.py

@@ -1,3 +1,6 @@
+from contextlib import contextmanager
+from io import BytesIO
+
 from dcim.models import Device, Module, Rack
 from django.contrib import messages
 from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
@@ -50,6 +53,24 @@ def _safe_return_url(request, default_name="home"):
     return reverse(default_name)
 
 
+# NetBox limits Pillow to 25 MP (bomb error above 50 MP), which rejects
+# current 50 MP smartphone photos such as Google Pixel images (8160x6144).
+BULK_IMAGE_MAX_PIXELS = 100_000_000
+
+
+@contextmanager
+def raised_image_pixel_limit():
+    from PIL import Image
+
+    original_limit = Image.MAX_IMAGE_PIXELS
+    if original_limit is not None and original_limit < BULK_IMAGE_MAX_PIXELS:
+        Image.MAX_IMAGE_PIXELS = BULK_IMAGE_MAX_PIXELS
+    try:
+        yield
+    finally:
+        Image.MAX_IMAGE_PIXELS = original_limit
+
+
 class BulkImageUploadView(ContentTypePermissionRequiredMixin, View):
     template_name = "netbox_utilities/bulk_image_upload.html"
 
@@ -65,9 +86,19 @@ class BulkImageUploadView(ContentTypePermissionRequiredMixin, View):
         parent = self._get_parent(request, request.POST)
         form = BulkImageUploadForm(request.POST, request.FILES)
         if form.is_valid():
+            with raised_image_pixel_limit():
+                return self._process_upload(request, form, parent)
+        return self._render(request, form, parent)
+
+    def _process_upload(self, request, form, parent):
         image_forms = self._build_image_forms(parent, form.cleaned_data)
         invalid = [image_form for image_form in image_forms if not image_form.is_valid()]
         if invalid:
+            for image_form in invalid:
+                image = image_form.files.get("image")
+                reason = self._image_error_reason(image)
+                if reason:
+                    form.add_error("images", f"{getattr(image, 'name', 'Bild')}: Pillow meldet: {reason}")
             for image_form in invalid:
                 filename = getattr(image_form.files.get("image"), "name", "Bild")
                 for errors in image_form.errors.values():
@@ -109,6 +140,26 @@ class BulkImageUploadView(ContentTypePermissionRequiredMixin, View):
             queryset = queryset.restrict(request.user, "view")
         return get_object_or_404(queryset, pk=object_id)
 
+    @staticmethod
+    def _image_error_reason(image):
+        """Return the underlying Pillow error, which Django hides behind a generic message."""
+        from PIL import Image
+
+        try:
+            if hasattr(image, "temporary_file_path"):
+                source = image.temporary_file_path()
+            else:
+                image.seek(0)
+                source = BytesIO(image.read())
+            with Image.open(source) as opened:
+                opened.verify()
+        except Exception as error:  # noqa: BLE001 - surface any Pillow failure
+            return f"{type(error).__name__}: {error}"
+        finally:
+            if hasattr(image, "seek"):
+                image.seek(0)
+        return None
+
     @staticmethod
     def _build_image_forms(parent, cleaned_data):
         image_forms = []

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "netbox-utilities"
-version = "0.14.0"
+version = "0.14.1"
 description = "Navigation, tenant utilities, connection VLANs, partial-width racks, and bulk operations for NetBox 4.6/4.7"
 readme = "README.md"
 requires-python = ">=3.12"