diff --git a/src/apify/request_loaders/_apify_request_list.py b/src/apify/request_loaders/_apify_request_list.py
index 2639387f..4a5fe971 100644
--- a/src/apify/request_loaders/_apify_request_list.py
+++ b/src/apify/request_loaders/_apify_request_list.py
@@ -2,13 +2,14 @@
 
 import asyncio
 import re
+from copy import deepcopy
 from itertools import chain
 from typing import Annotated, Any
 
 from pydantic import BaseModel, ConfigDict, Field, TypeAdapter
 from pydantic.alias_generators import to_camel
 
-from crawlee._types import HttpMethod
+from crawlee._types import HttpMethod, JsonSerializable
 from crawlee.http_clients import HttpClient, ImpitHttpClient
 from crawlee.request_loaders import RequestList
 
@@ -26,7 +27,7 @@ class _RequestDetails(BaseModel):
     method: HttpMethod = 'GET'
     payload: str = ''
     headers: Annotated[dict[str, str], Field(default_factory=dict)]
-    user_data: Annotated[dict[str, str], Field(default_factory=dict)]
+    user_data: Annotated[dict[str, JsonSerializable], Field(default_factory=dict)]
 
 
 class _RequestsFromUrlInput(_RequestDetails):
@@ -154,7 +155,9 @@ async def _process_remote_url(request_input: _RequestsFromUrlInput, http_client:
                 method=request_input.method,
                 payload=request_input.payload.encode('utf-8'),
                 headers=request_input.headers,
-                user_data=request_input.user_data,
+                # Deep-copy so `Request.from_url` (which writes `__crawlee` into the dict) cannot corrupt
+                # the shared input, and nested JSON values are not aliased across the requests.
+                user_data=deepcopy(request_input.user_data),
             )
             for match in matches
         ]
diff --git a/tests/unit/actor/test_request_list.py b/tests/unit/actor/test_request_list.py
index cd35b755..b5edeecf 100644
--- a/tests/unit/actor/test_request_list.py
+++ b/tests/unit/actor/test_request_list.py
@@ -41,13 +41,19 @@
             },
             id='all_options',
         ),
+        pytest.param(
+            {
+                'userData': {'depth': 1, 'isStartUrl': True, 'nested': {'key': 'value'}},
+            },
+            id='non_string_user_data',
+        ),
     ],
 )
 async def test_request_list_open_request_types(
     request_method: HttpMethod,
     optional_input: dict[str, Any],
 ) -> None:
-    """Test proper request list generation from both minimal and full inputs for all method types for simple input."""
+    """Test proper request list generation from various optional inputs for all method types for simple input."""
     minimal_request_dict_input = {
         'url': 'https://www.abc.com',
         'method': request_method,
@@ -190,6 +196,33 @@ async def test_request_list_open_from_url_additional_inputs(httpserver: HTTPServ
     assert request.user_data == expected_user_data
 
 
+async def test_request_list_open_from_url_with_user_data_and_multiple_urls(httpserver: HTTPServer) -> None:
+    """Test that a remote source with `userData` yielding multiple URLs creates all requests with that user data."""
+    expected_urls = {'https://www.one.com', 'https://www.two.com'}
+    httpserver.expect_oneshot_request('/file.txt').respond_with_data(status=200, response_data=' '.join(expected_urls))
+
+    request_list = await ApifyRequestList.open(
+        request_list_sources_input=[
+            {'requestsFromUrl': httpserver.url_for('/file.txt'), 'userData': {'depth': 1, 'nested': {'key': 'value'}}},
+        ],
+    )
+
+    requests = []
+    while request := await request_list.fetch_next_request():
+        requests.append(request)
+
+    assert {request.url for request in requests} == expected_urls
+    for request in requests:
+        assert request.user_data['depth'] == 1
+        assert request.user_data['nested'] == {'key': 'value'}
+
+    # Each request owns an independent copy; mutating one must not leak into the others.
+    nested = requests[0].user_data['nested']
+    assert isinstance(nested, dict)
+    nested['key'] = 'mutated'
+    assert requests[1].user_data['nested'] == {'key': 'value'}
+
+
 async def test_request_list_open_from_url_non_utf8_body(httpserver: HTTPServer) -> None:
     """Test that a non-UTF-8 response body does not crash ApifyRequestList.open."""
     expected_url = 'https://www.someurl.com'