diff --git a/ChangeLog.d/fix-aes-cbc-iv-corruption b/ChangeLog.d/fix-aes-cbc-iv-corruption
new file mode 100644
index 0000000..11eb946
--- /dev/null
+++ b/ChangeLog.d/fix-aes-cbc-iv-corruption
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix a potential corruption of the passed-in IV when mbedtls_aes_crypt_cbc()
+     is called with zero length and padlock is not enabled.
diff --git a/library/aes.c b/library/aes.c
index 592ca64..b55c08a 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -1094,6 +1094,11 @@
         return MBEDTLS_ERR_AES_BAD_INPUT_DATA;
     }
 
+    /* Nothing to do if length is zero. */
+    if (length == 0) {
+        return 0;
+    }
+
     if (length % 16) {
         return MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH;
     }