diff --git a/homeassistant/helpers/device_registry.py b/homeassistant/helpers/device_registry.py
index 1f7f0f0699d1ba..e08aec135e6d88 100644
--- a/homeassistant/helpers/device_registry.py
+++ b/homeassistant/helpers/device_registry.py
@@ -1757,6 +1757,25 @@ def _unindex_entry(
                 if not self._orphaned_identifiers[identifier]:
                     del self._orphaned_identifiers[identifier]
 
+    def get_orphaned_entries(
+        self,
+        identifiers: set[tuple[str, str]],
+        connections: set[tuple[str, str]],
+        domain: str,
+    ) -> list[DeletedDeviceEntry]:
+        """Get the orphans of a domain holding any of the given keys.
+
+        Orphans are matched on their recorded domain so a chance identifier or connection
+        collision doesn't match another integration's device. connections must be
+        normalized.
+        """
+        orphans: dict[str, DeletedDeviceEntry] = {}
+        for identifier in identifiers:
+            orphans.update(self._orphaned_identifiers.get(identifier, {}))
+        for connection in connections:
+            orphans.update(self._orphaned_connections.get(connection, {}))
+        return [entry for entry in orphans.values() if entry.domain == domain]
+
     def get_orphaned_entry(
         self,
         identifiers: set[tuple[str, str]] | None,
@@ -1770,15 +1789,10 @@ def get_orphaned_entry(
         (carried over by the migration with no recoverable domain) is left for the
         periodic purge rather than restored.
         """
-        orphans: dict[str, DeletedDeviceEntry] = {}
-        for identifier in identifiers or ():
-            orphans.update(self._orphaned_identifiers.get(identifier, {}))
-        for connection in _normalize_connections(connections or set()):
-            orphans.update(self._orphaned_connections.get(connection, {}))
-        for entry in orphans.values():
-            if entry.domain == domain:
-                return entry
-        return None
+        orphans = self.get_orphaned_entries(
+            identifiers or set(), _normalize_connections(connections or set()), domain
+        )
+        return orphans[0] if orphans else None
 
 
 class DeviceRegistry(BaseRegistry[dict[str, list[dict[str, Any]]]]):
@@ -4368,16 +4382,10 @@ def _async_orphan_deleted_device(
             # device from the same integration is orphaned, drop any existing orphan
             # it overlaps so the newest one wins deterministically instead of shadowing
             # it.
-            for existing in list(self._deleted_devices.values()):
-                if (
-                    existing.config_entry_id is None
-                    and existing.domain == domain
-                    and (
-                        existing.connections & deleted_device.connections
-                        or existing.identifiers & deleted_device.identifiers
-                    )
-                ):
-                    del self._deleted_devices[existing.id]
+            for existing in self._deleted_devices.get_orphaned_entries(
+                deleted_device.identifiers, deleted_device.connections, domain
+            ):
+                del self._deleted_devices[existing.id]
         self._deleted_devices[deleted_device.id] = attr.evolve(
             deleted_device,
             config_entry_id=None,
diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 30cfabe0a4fdab..66456791d4a892 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -48,7 +48,7 @@ Jinja2==3.1.6
 lru-dict==1.4.1
 mutagen==1.48.1
 openai==2.45.0
-orjson==3.12.0
+orjson==3.11.9
 packaging>=23.1
 paho-mqtt==2.1.0
 Pillow==12.3.0
diff --git a/pyproject.toml b/pyproject.toml
index 85e74c8facf1cc..95561ae862dffe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -61,7 +61,10 @@ dependencies = [
   "Pillow==12.3.0",
   "propcache==0.5.2",
   "pyOpenSSL==26.2.0",
-  "orjson==3.12.0",
+  # Do not bump orjson until the very aggressive buffer resizing introduced in
+  # 3.12.0, which causes memory use to balloon, has been adjusted or a workaround
+  # is available.
+  "orjson==3.11.9",
   "packaging>=23.1",
   "psutil-home-assistant==0.0.1",
   "python-slugify==8.0.4",
diff --git a/requirements.txt b/requirements.txt
index 87ed11507892c3..88cee4233102d1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ infrared-protocols==10.0.0
 Jinja2==3.1.6
 lru-dict==1.4.1
 mutagen==1.48.1
-orjson==3.12.0
+orjson==3.11.9
 packaging>=23.1
 Pillow==12.3.0
 probatio==0.11.4
diff --git a/tests/helpers/test_storage.py b/tests/helpers/test_storage.py
index 60daa8d8ceea09..249dab632fe5e2 100644
--- a/tests/helpers/test_storage.py
+++ b/tests/helpers/test_storage.py
@@ -891,7 +891,7 @@ def _corrupt_store():
         assert issue_entry.translation_placeholders["storage_key"] == storage_key
         assert issue_entry.issue_domain == HOMEASSISTANT_DOMAIN
         assert (
-            "unexpected character, expected a JSON value: line 1 column 1 (char 0)"
+            "unexpected character: line 1 column 1 (char 0)"
             in issue_entry.translation_placeholders["error"]
         )