backport r65264
diff --git a/Misc/NEWS b/Misc/NEWS
index 008b126..d1b5778 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -29,6 +29,9 @@
 Library
 -------
 
+- Issue #2523: Fix quadratic behaviour when read()ing a binary file without
+  asking for a specific length.
+
 - Issue #3449: Update decimal module to use most recent specification
   (v. 1.68) and tests (v. 2.58) from IBM.