python · kumaraditya303 · Dec 10, 2025 · Nov 28, 2025 · Nov 28, 2025 · Nov 28, 2025
@@ -1253,6 +1253,20 @@ class Spec2:
                origin = "a\x00b"
            _imp.create_dynamic(Spec2())

+    def test_create_builtin(self):
+        class Spec:
+            name = None
+        spec = Spec()
+
+        with self.assertRaisesRegex(TypeError, 'name must be string, not NoneType'):
+            _imp.create_builtin(spec)
+
+        spec.name = ""
+
+        # gh-142029
+        with self.assertRaisesRegex(ValueError, 'name must not be empty'):
+            _imp.create_builtin(spec)
+
    def test_filter_syntax_warnings_by_module(self):
        module_re = r'test\.test_import\.data\.syntax_warnings\z'
        unload('test.test_import.data.syntax_warnings')

diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-11-28-16-45-07.gh-issue-142029.JuXiKu.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-11-28-16-45-07.gh-issue-142029.JuXiKu.rst
@@ -0,0 +1,2 @@
+Raise :exc:`ValueError` instead of crashing when empty string is used as a name
+in ``_imp.create_builtin()``.
@@ -4420,6 +4420,12 @@ _imp_create_builtin(PyObject *module, PyObject *spec)
        return NULL;
    }

+    if (PyUnicode_GetLength(name) == 0) {
+        PyErr_Format(PyExc_ValueError, "name must not be empty");
+        Py_DECREF(name);
+        return NULL;
+    }
+
    PyObject *mod = create_builtin(tstate, name, spec, NULL);
    Py_DECREF(name);
    return mod;
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Raise :exc:`ValueError` instead of crashing when empty string is used as a name
		in ``_imp.create_builtin()``.