Changelog: Added CVE.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/ChangeLog.d/mbedtls_ssl_set_hostname.txt b/ChangeLog.d/mbedtls_ssl_set_hostname.txt
index cb61ed1..236f491 100644
--- a/ChangeLog.d/mbedtls_ssl_set_hostname.txt
+++ b/ChangeLog.d/mbedtls_ssl_set_hostname.txt
@@ -16,3 +16,4 @@
      The library will now prevent the handshake and return
      MBEDTLS_ERR_SSL_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME
      if mbedtls_ssl_set_hostname() has not been called.
+     CVE-2025-27809