diff --git a/ChangeLog b/ChangeLog
index 7c04ce0..b6067c6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,11 @@
 = mbed TLS 2.1.x branch released xxxx-xx-xx
 
 Security
+   * Fixed unlimited overread of heap-based buffer in mbedtls_ssl_read().
+     The issue could only happen client-side with renegotiation enabled.
+     Could result in DoS (application crash) or information leak
+     (if the application layer sent data read from mbedtls_ssl_read()
+     back to the server or to a third party). Can be triggered remotely.
    * Add exponent blinding to RSA private operations as a countermeasure
      against side-channel attacks like the cache attack described in
      https://arxiv.org/abs/1702.08719v2.