diff --git a/controller/internal/i18n/locales/en.json b/controller/internal/i18n/locales/en.json
index 7b453d7..efebf54 100644
--- a/controller/internal/i18n/locales/en.json
+++ b/controller/internal/i18n/locales/en.json
@@ -74,6 +74,7 @@
   "app_export.titkositasi_jelszo": "Encryption password",
   "app_export.valassz_tarolot": "Choose a storage...",
   "app_export.valaszthato_tartalom": "Optional content:",
+  "app_export.network_drive_needs_password": "A bundle can go onto a network drive (NAS) only with a password, because it also holds the passwords of the app. Set a password, or choose an attached drive.",
   "app_import.a_feltoltes_megszakadt_ellenorizze_a": "The upload stopped — check the connection, then try again.",
   "app_import.adatbazis": "Database:",
   "app_import.adatok": "Data:",
diff --git a/controller/internal/i18n/locales/hu.json b/controller/internal/i18n/locales/hu.json
index e31c607..dc70286 100644
--- a/controller/internal/i18n/locales/hu.json
+++ b/controller/internal/i18n/locales/hu.json
@@ -70,6 +70,7 @@
   "app_export.titkositasi_jelszo": "Titkosítási jelszó",
   "app_export.valassz_tarolot": "Válassz tárolót...",
   "app_export.valaszthato_tartalom": "Választható tartalom:",
+  "app_export.network_drive_needs_password": "Hálózati tárhelyre (NAS) csak jelszóval védett csomagot menthetsz, mert a csomag az alkalmazás jelszavait is tartalmazza. Adj meg jelszót, vagy válassz csatlakoztatott meghajtót.",
   "app_import.a_feltoltes_megszakadt_ellenorizze_a": "A feltöltés megszakadt — ellenőrizze a kapcsolatot, majd próbálja újra.",
   "app_import.adatbazis": "Adatbázis:",
   "app_import.adatok": "Adatok:",
diff --git a/controller/internal/web/handler_export.go b/controller/internal/web/handler_export.go
index 83ceaff..6b2b2ee 100644
--- a/controller/internal/web/handler_export.go
+++ b/controller/internal/web/handler_export.go
@@ -204,6 +204,18 @@ func (s *Server) apiExportStart(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// R-126 (operator ruling 2026-10-05, 09 §3 decision 128): a `.fab` carries the app's secrets in
+	// plaintext unless a bundle password is set, and a network drive is reachable by every device on
+	// the household's LAN. So an export WITHOUT a password to any network drive is refused; with a
+	// password it proceeds. The destination is already known to be registered (isValidDrivePath), so
+	// IsNetworkStoragePath classifies it by its Kind — the only discriminator (see RefuseAsAppNamespace).
+	// Pinned by TestExportStart_NetworkDriveNeedsPassword.
+	if req.Password == "" && s.settings.IsNetworkStoragePath(req.DestDrive) {
+		s.logger.Printf("[INFO] [web] apiExportStart: refused — no password for network drive %q (stack=%s)", req.DestDrive, req.StackName)
+		jsonError(w, s.msg(r, "app_export.network_drive_needs_password"), http.StatusBadRequest)
+		return
+	}
+
 	err := s.appExporter.StartExport(appexport.ExportRequest{
 		StackName:        req.StackName,
 		DestDrive:        req.DestDrive,
diff --git a/controller/internal/web/r126_export_network_test.go b/controller/internal/web/r126_export_network_test.go
new file mode 100644
index 0000000..191a18c
--- /dev/null
+++ b/controller/internal/web/r126_export_network_test.go
@@ -0,0 +1,105 @@
+package web
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gitea.dooplex.hu/admin/felhom-controller/internal/appbackup"
+	"gitea.dooplex.hu/admin/felhom-controller/internal/appexport"
+	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
+)
+
+// R-126 (operator ruling 2026-10-05, 09 §3 decision 128): an export WITHOUT a bundle password to a
+// network drive is refused; WITH a password it runs; a local drive without a password is unchanged.
+// The assertions are the consequence — whether a .fab lands on the destination — not only the status.
+func TestExportStart_NetworkDriveNeedsPassword(t *testing.T) {
+	build := func(t *testing.T, kind string) (*Server, *appexport.Exporter, string) {
+		s := testServer(t)
+		s.cfg.Paths.DataDir = t.TempDir()
+		drive := t.TempDir()
+		stackDir := t.TempDir()
+		os.WriteFile(filepath.Join(stackDir, "docker-compose.yml"), []byte("services: {}\n"), 0644)
+		fabWrite(t, drive, "userdata/media/books/a.epub", "BOOK")
+		prov := &fabWebProvider{stackDir: stackDir, stacksDir: t.TempDir(), hddPath: drive,
+			binds: []appbackup.ClassifiedBind{
+				{ComposeBind: appbackup.ComposeBind{Root: appbackup.RootUserdata, RelPath: "media/books"}, Class: appbackup.ClassMandatory},
+			}}
+		e := appexport.NewExporter(prov, s.logger, "test")
+		s.appExporter = e
+		if err := s.settings.AddStoragePath(settings.StoragePath{Path: drive, Label: "d", Kind: kind, Schedulable: true}); err != nil {
+			t.Fatal(err)
+		}
+		if got := s.settings.IsNetworkStoragePath(drive); got != (kind == settings.StorageKindNetwork) {
+			t.Fatalf("fixture: IsNetworkStoragePath(%q)=%v for kind %q", drive, got, kind)
+		}
+		return s, e, drive
+	}
+	start := func(s *Server, drive, password string) (*httptest.ResponseRecorder, map[string]interface{}) {
+		body, _ := json.Marshal(map[string]interface{}{"stack_name": "calibre-web", "dest_drive": drive, "password": password})
+		rr := httptest.NewRecorder()
+		req := httptest.NewRequest(http.MethodPost, "/api/export/start", strings.NewReader(string(body)))
+		req.Header.Set("Content-Type", "application/json")
+		s.apiExportStart(rr, req)
+		var resp map[string]interface{}
+		json.Unmarshal(rr.Body.Bytes(), &resp)
+		return rr, resp
+	}
+	fabCount := func(dir string) int {
+		n := 0
+		filepath.Walk(dir, func(p string, info os.FileInfo, err error) error {
+			if err == nil && strings.HasSuffix(p, ".fab") {
+				n++
+			}
+			return nil
+		})
+		return n
+	}
+
+	t.Run("network drive, no password: refused, nothing written", func(t *testing.T) {
+		s, e, drive := build(t, settings.StorageKindNetwork)
+		rr, resp := start(s, drive, "")
+		if rr.Code != http.StatusBadRequest || resp["ok"] != false {
+			t.Fatalf("want 400 ok=false, got %d %s", rr.Code, rr.Body.String())
+		}
+		msg, _ := resp["error"].(string)
+		// ASCII fragments of the Hungarian sentence (positive), and never the raw key (negative).
+		if !strings.Contains(msg, "(NAS)") || !strings.Contains(msg, "jelsz") || strings.Contains(msg, "app_export.") {
+			t.Errorf("refusal text is not the household sentence: %q", msg)
+		}
+		if j := e.GetActiveJob(); j != nil {
+			t.Errorf("an export job started despite the refusal: %v", j.Snapshot())
+		}
+		if n := fabCount(drive); n != 0 {
+			t.Errorf("%d .fab file(s) landed on the network drive without a password", n)
+		}
+	})
+
+	t.Run("network drive, with password: runs", func(t *testing.T) {
+		s, e, drive := build(t, settings.StorageKindNetwork)
+		rr, resp := start(s, drive, "correct horse battery")
+		if rr.Code != http.StatusOK || resp["ok"] != true {
+			t.Fatalf("want 200 ok=true, got %d %s", rr.Code, rr.Body.String())
+		}
+		waitExportDone(t, e)
+		if n := fabCount(drive); n != 1 {
+			t.Errorf("want 1 .fab on the network drive, got %d", n)
+		}
+	})
+
+	t.Run("local drive, no password: unchanged", func(t *testing.T) {
+		s, e, drive := build(t, "")
+		rr, resp := start(s, drive, "")
+		if rr.Code != http.StatusOK || resp["ok"] != true {
+			t.Fatalf("want 200 ok=true, got %d %s", rr.Code, rr.Body.String())
+		}
+		waitExportDone(t, e)
+		if n := fabCount(drive); n != 1 {
+			t.Errorf("want 1 .fab on the local drive, got %d", n)
+		}
+	})
+}
diff --git a/controller/scripts/i18n_go_keys.json b/controller/scripts/i18n_go_keys.json
index f5fb644..243ad84 100644
--- a/controller/scripts/i18n_go_keys.json
+++ b/controller/scripts/i18n_go_keys.json
@@ -8,6 +8,7 @@
     "banner.missed_backup.suggest": "BORN AS A KEY, v0.295.0 (R-871, `09` decision 110) -- a NEW sentence of the missed-backup banner, never a Go literal; pinned in Hungarian by TestR871_BannerShownThenClosedUntilTheNextMiss and the parity fixture launcher_missed_backup.",
     "event.backup_catchup_done": "BORN AS A KEY, v0.295.0 (R-871, `09` decision 109) -- the catch-up's NEW timeline line, never a Go literal; sent by Notifier.NotifyBackupCatchUp (wiring pinned by TestR871_CatchUpWiring).",
     "badge.lifecycle.abandoned": "R-589 (v0.258.0) -- localeFuncs; the Hungarian form stays in templateFuncMap, pinned by TestLocaleFuncsHungarianBundleMatchesFuncMap",
+    "app_export.network_drive_needs_password": "BORN AS A KEY (R-126, `09` decision 128) -- a NEW sentence, never a Go literal: the export refusal for a network drive without a bundle password. Pinned in Hungarian by TestExportStart_NetworkDriveNeedsPassword.",
     "badge.lifecycle.abandoned.title": "R-589 (v0.258.0) -- localeFuncs; the Hungarian form stays in templateFuncMap, pinned by TestLocaleFuncsHungarianBundleMatchesFuncMap",
     "badge.update.ahead.title": "BORN AS A KEY, v0.260.0 (R-524) -- a NEW sentence, never a Go literal, so there is nothing in the base capture to measure it against. Pinned in both languages by TestUpdateBadgeFollowsTheLanguage.",
     "badge.update.behind": "R-589 (v0.258.0) -- localeFuncs; the Hungarian form stays in templateFuncMap, pinned by TestLocaleFuncsHungarianBundleMatchesFuncMap",