bail in unicode error's __str__ methods if the objects are not properly initialized (closes #21134)
diff --git a/Misc/NEWS b/Misc/NEWS
index 24047bb..4933cb2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 
 - Issue #20437: Fixed 43 potential bugs when deleting objects references.
 
+- Issue #21134: Fix segfault when str is called on an uninitialized
+  UnicodeEncodeError, UnicodeDecodeError, or UnicodeTranslateError object.
+
 - Issue #20494: Ensure that free()d memory arenas are really released on POSIX
   systems supporting anonymous memory mappings.  Patch by Charles-François
   Natali.