Issue #19638: Raise ValueError instead of crashing when converting billion character strings to float.
diff --git a/Misc/NEWS b/Misc/NEWS
index f845ae3..856daec 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -9,6 +9,9 @@
 Core and Builtins
 -----------------
 
+- Issue #19638: Fix possible crash / undefined behaviour from huge (more than 2
+  billion characters) input strings in _Py_dg_strtod.
+
 Library
 -------