diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-10-13-06-23-56.gh-issue-159294.9LTsNA.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-13-06-23-56.gh-issue-159294.9LTsNA.rst
new file mode 100644
index 00000000000000..9504f1f753cbec
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-13-06-23-56.gh-issue-159294.9LTsNA.rst
@@ -0,0 +1,3 @@
+Fix a crash in a debug build when creating an :exc:`ExceptionGroup` or
+:exc:`BaseExceptionGroup` fails with :exc:`MemoryError`. Patch by Christian
+Aurich Zanettini Martins.
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index 67ba540b552a58..b3473751684f0f 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -998,11 +998,11 @@ BaseExceptionGroup_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
          */
         cls = (PyTypeObject*)PyExc_BaseExceptionGroup;
     }
-    PyBaseExceptionGroupObject *self =
-        PyBaseExceptionGroupObject_CAST(BaseException_new(cls, args, kwds));
-    if (!self) {
+    PyObject *op = BaseException_new(cls, args, kwds);
+    if (!op) {
         goto error;
     }
+    PyBaseExceptionGroupObject *self = PyBaseExceptionGroupObject_CAST(op);
 
     self->msg = Py_NewRef(message);
     self->excs = exceptions;