diff --git a/src/app_security.cpp b/src/app_security.cpp
index 60268b6..8ff032f 100644
--- a/src/app_security.cpp
+++ b/src/app_security.cpp
@@ -1401,6 +1401,15 @@ void App::renderEncryptWalletDialog() {
             ImGui::EndDisabled();
             EndOverlayDialog();
         }
+
+        // Wipe the passphrase buffers if the dialog was dismissed (X / Esc /
+        // outside-click) without submitting. The success path already zeroes
+        // them in changePassphrase(); the failure path keeps them for retry.
+        if (!show_change_passphrase_) {
+            memset(change_old_pass_buf_, 0, sizeof(change_old_pass_buf_));
+            memset(change_new_pass_buf_, 0, sizeof(change_new_pass_buf_));
+            memset(change_confirm_buf_, 0, sizeof(change_confirm_buf_));
+        }
     }
 }