https://github.com/python/cpython/commit/08759ff1015552d58c1f6ffa13ea08b0ae32e6c0
commit: 08759ff1015552d58c1f6ffa13ea08b0ae32e6c0
branch: main
author: An Long <[email protected]>
committer: sobolevn <[email protected]>
date: 2026-07-07T16:03:34Z
summary:

gh-153205: Set `MemoryError` in stackref array conversion (#153206)

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: sobolevn <[email protected]>

files:
A 
Misc/NEWS.d/next/Core_and_Builtins/2026-07-07-04-16-48.gh-issue-153205.5fE8QZ.rst
M Python/ceval.c

diff --git 
a/Misc/NEWS.d/next/Core_and_Builtins/2026-07-07-04-16-48.gh-issue-153205.5fE8QZ.rst
 
b/Misc/NEWS.d/next/Core_and_Builtins/2026-07-07-04-16-48.gh-issue-153205.5fE8QZ.rst
new file mode 100644
index 00000000000000..9ccfbff7ee6977
--- /dev/null
+++ 
b/Misc/NEWS.d/next/Core_and_Builtins/2026-07-07-04-16-48.gh-issue-153205.5fE8QZ.rst
@@ -0,0 +1,2 @@
+Fix a potential :exc:`SystemError` during vector calls when memory allocation 
fails.
+A :exc:`MemoryError` is now raised instead.
diff --git a/Python/ceval.c b/Python/ceval.c
index f3f03b28112137..3f636c3416e120 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -1056,6 +1056,7 @@ _PyObjectArray_FromStackRefArray(_PyStackRef *input, 
Py_ssize_t nargs, PyObject
         // +1 in case PY_VECTORCALL_ARGUMENTS_OFFSET is set.
         result = PyMem_Malloc((nargs + 1) * sizeof(PyObject *));
         if (result == NULL) {
+            PyErr_NoMemory();
             return NULL;
         }
     }

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