diff -up src/libgksu-2.0.12/libgksu/libgksu.c.orig src/libgksu-2.0.12/libgksu/libgksu.c
--- src/libgksu-2.0.12/libgksu/libgksu.c.orig	2021-10-24 14:38:42.899999999 -0600
+++ src/libgksu-2.0.12/libgksu/libgksu.c	2021-10-24 14:41:17.249999999 -0600
@@ -1277,7 +1277,7 @@ sudo_prepare_xauth (GksuContext *context
   context->dir = g_strdup (mkdtemp(template));
   if (!context->dir)
     {
-      fprintf (stderr, strerror(errno));
+      fprintf (stderr, "%s", strerror(errno));
       return FALSE;
     }
 
@@ -2238,7 +2238,7 @@ gksu_su_fuller (GksuContext *context,
 					  " %s"), converted_str, "gksu: waiting");
 	      g_free (converted_str);
 
-	      g_set_error (error, gksu_quark, GKSU_ERROR_HELPER, emsg);
+	      g_set_error (error, gksu_quark, GKSU_ERROR_HELPER, "%s", emsg);
 	      g_free (emsg);
 
 	      if (context->debug)