diff -up vim80/src/getchar.c.cve vim80/src/getchar.c

--- vim80/src/getchar.c.cve	2019-06-14 13:46:17.269523985 +0200

+++ vim80/src/getchar.c	2019-06-14 13:46:58.427169288 +0200

@@ -1418,6 +1418,12 @@ openscript(

 	EMSG(_(e_nesting));

 	return;

     }

+

+    // Disallow sourcing a file in the sandbox, the commands would be executed

+    // later, possibly outside of the sandbox.

+    if (check_secure())

+	return;

+

 #ifdef FEAT_EVAL

     if (ignore_script)

 	/* Not reading from script, also don't open one.  Warning message? */