Add ChangeLog entry for previous security fix
Fixes #825
diff --git a/ChangeLog b/ChangeLog
index 51ad727..0e864d1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS x.x.x branch released xxxx-xx-xx
+
+Security
+ * Fix a bug in the X.509 module potentially leading to a buffer overread
+ during CRT verification or to invalid or omitted checks for certificate
+ validity. The former can be triggered remotely, while the latter requires
+ a non DER-compliant certificate correctly signed by a trusted CA, or a
+ trusted CA with a non DER-compliant certificate. Found by luocm on GitHub.
+ Fixes #825.
+
= mbed TLS 2.7.1 branch released 2018-02-23
Default behavior changes