Index: b/g10/keyserver.c
===================================================================
--- b/g10/keyserver.c
+++ b/g10/keyserver.c
@@ -1089,6 +1089,11 @@
       fingerprint_from_pk (pk, fpr, &fpr_len);
       keyid_from_pk (pk, keyid);
 
+      if (pk.version != 4) {
+	log_error(_("importing v3 or older keys from keyservers is unsafe: skipping a returned v3 public key\n"))
+	  continue;
+      }
+
       /* Compare requested and returned fingerprints if available. */
       for (n = 0; n < ndesc; n++)
         {