Index: node/sbin/munin-node
--- node/sbin/munin-node.orig
+++ node/sbin/munin-node
@@ -52,6 +52,9 @@ sub main
         $ENV{$key} =~ /^(.*)$/;
         $ENV{$key} = $1;
     }
+    # plugins run in taint mode because the uid is changed, so the path
+    # must not contain writable directories.
+    $ENV{PATH}='/bin:/sbin:/usr/bin:/usr/sbin:${PREFIX}/bin:${PREFIX}/sbin';
 
     parse_args();