- Issue #2588, #2589: Fix potential integer underflow and overflow
  conditions in the PyOS_vsnprintf C API function.

This is a backport of r63728 and r63734 from trunk.
diff --git a/Misc/NEWS b/Misc/NEWS
index 4eb8a80..6363f80 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -41,6 +41,9 @@
   less than zero will now raise a SystemError and return NULL to indicate a
   bug in the calling C code.
 
+- Issue #2588, #2589: Fix potential integer underflow and overflow
+  conditions in the PyOS_vsnprintf C API function.
+
 
 Library
 -------