diff -up libvncserver-LibVNCServer-0.9.13/libvncclient/vncviewer.c.orig libvncserver-LibVNCServer-0.9.13/libvncclient/vncviewer.c
--- libvncserver-LibVNCServer-0.9.13/libvncclient/vncviewer.c.orig	2022-09-28 12:45:54.343732226 +0800
+++ libvncserver-LibVNCServer-0.9.13/libvncclient/vncviewer.c	2022-09-28 12:46:47.518913917 +0800
@@ -534,6 +534,8 @@ void rfbClientCleanup(rfbClient* client)
     client->clientData = next;
   }
 
+  free(client->vncRec);
+
   if (client->sock != RFB_INVALID_SOCKET)
     rfbCloseSocket(client->sock);
   if (client->listenSock != RFB_INVALID_SOCKET)