diff --git a/lib/efi_loader/efi_device_path_to_text.c b/lib/efi_loader/efi_device_path_to_text.c
index 81b8ac2..edc9fdc 100644
--- a/lib/efi_loader/efi_device_path_to_text.c
+++ b/lib/efi_loader/efi_device_path_to_text.c
@@ -67,7 +67,8 @@
 
 		s += sprintf(s, "VenHw(%pUl", &vdp->guid);
 		n = (int)vdp->dp.length - sizeof(struct efi_device_path_vendor);
-		if (n > 0) {
+		/* Node must fit into MAX_NODE_LEN) */
+		if (n > 0 && n < MAX_NODE_LEN / 2 - 22) {
 			s += sprintf(s, ",");
 			for (i = 0; i < n; ++i)
 				s += sprintf(s, "%02x", vdp->vendor_data[i]);
@@ -251,7 +252,8 @@
 
 		s += sprintf(s, "VenMedia(%pUl", &vdp->guid);
 		n = (int)vdp->dp.length - sizeof(struct efi_device_path_vendor);
-		if (n > 0) {
+		/* Node must fit into MAX_NODE_LEN) */
+		if (n > 0 && n < MAX_NODE_LEN / 2 - 24) {
 			s += sprintf(s, ",");
 			for (i = 0; i < n; ++i)
 				s += sprintf(s, "%02x", vdp->vendor_data[i]);