diff --git a/SECURITY.md b/SECURITY.md
index b4d564e..e6d0bbf 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -149,3 +149,8 @@
 validation is performed separately to ensure that they are compliant to the
 relevant specifications. This makes Mbed TLS on its own unsuitable use in a
 Certificate Authority (CA).
+
+However, Mbed TLS aims to protect against memory corruption and other
+undefined behavior when parsing certificates and CSRs. If a CSR or signed
+certificate causes undefined behavior when it is parsed by Mbed TLS, that
+is considered a security vulnerability.