diff --git a/src/specify_cli/presets/__init__.py b/src/specify_cli/presets/__init__.py
index a5cea4f958..b8c8f390db 100644
--- a/src/specify_cli/presets/__init__.py
+++ b/src/specify_cli/presets/__init__.py
@@ -4165,6 +4165,13 @@ def _validate_catalog_url(self, url: str) -> None:
         try:
             parsed = urlparse(url)
             hostname = parsed.hostname
+            # Accessing ``port`` performs urllib's syntax/range validation;
+            # ``hostname`` alone does not, so a non-numeric or out-of-range
+            # port would otherwise pass validation here and only fail later,
+            # at fetch time, as a raw error this function does not translate
+            # into PresetValidationError. Mirrors specify_cli.catalogs and
+            # bundler/services/adapters.py's copy of this same guard.
+            _ = parsed.port
         except ValueError:
             raise PresetValidationError(f"Catalog URL is malformed: {url}") from None
         is_localhost = hostname in ("localhost", "127.0.0.1", "::1")
diff --git a/tests/test_presets.py b/tests/test_presets.py
index f30ab4909e..8f9a2e358f 100644
--- a/tests/test_presets.py
+++ b/tests/test_presets.py
@@ -2086,6 +2086,25 @@ def test_validate_catalog_url_malformed_rejected(self, project_dir):
         with pytest.raises(PresetValidationError, match="malformed"):
             catalog._validate_catalog_url("https://[::1")
 
+    def test_validate_catalog_url_out_of_range_port_rejected(self, project_dir):
+        """An out-of-range port raises ValueError lazily on ``.port`` access.
+
+        ``urlparse(...).hostname`` alone does not validate the port, so
+        without a ``_ = parsed.port`` probe inside the try/except, a URL like
+        ``https://example.com:99999/catalog.json`` sails through this
+        validator and only fails later, at fetch time, with a raw
+        untranslated error instead of a clean ``PresetValidationError``. The
+        sibling ``preset add --from <url>`` download-URL guard already
+        catches this shape (see
+        ``test_preset_add_from_url_out_of_range_port_exits_cleanly``); this
+        catalog-source-URL validator had drifted from it and from the
+        original guard in ``specify_cli.catalogs``/
+        ``bundler/services/adapters.py``.
+        """
+        catalog = PresetCatalog(project_dir)
+        with pytest.raises(PresetValidationError, match="malformed"):
+            catalog._validate_catalog_url("https://example.com:99999/catalog.json")
+
     def test_env_var_catalog_url(self, project_dir, monkeypatch):
         """Test catalog URL from environment variable."""
         monkeypatch.setenv("SPECKIT_PRESET_CATALOG_URL", "https://custom.example.com/catalog.json")