1 files changed, 5 insertions, 0 deletions
diff --git a/Python/crossinterp.c b/Python/crossinterp.c
index 7aaa045f375..0a106ad636b 100644
--- a/Python/crossinterp.c
+++ b/Python/crossinterp.c
@@ -342,6 +342,11 @@ _copy_string_obj_raw(PyObject *strobj, Py_ssize_t *p_size)
         return NULL;
     }
 
+    if (size != (Py_ssize_t)strlen(str)) {
+        PyErr_SetString(PyExc_ValueError, "found embedded NULL character");
+        return NULL;
+    }
+
     char *copied = PyMem_RawMalloc(size+1);
     if (copied == NULL) {
         PyErr_NoMemory();