Disallow wildcard matching of a TLD specified as a FQDN.

Found by Frank Denis.

ok tb@

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lib/libtls/tls_verify.c b/src/lib/libtls/tls_verify.c
index de95ab8117..edf2bcdae3 100644
--- a/src/lib/libtls/tls_verify.c
+++ b/src/lib/libtls/tls_verify.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tls_verify.c,v 1.33 2026/03/28 11:33:33 tb Exp $ */
+/* $OpenBSD: tls_verify.c,v 1.34 2026/05/30 17:06:09 jsing Exp $ */
 /*
  * Copyright (c) 2014 Jeremie Courreges-Anglas <jca@openbsd.org>
  *
@@ -59,6 +59,9 @@ tls_match_name(const char *cert_name, const char *name)
                 /* Disallow "*.bar" */
                 if (next_dot == NULL)
                         return -1;
+                /* Disallow "*.bar." */
+                if (next_dot[1] == '\0')
+                        return -1;
                 /* Disallow "*.bar.." */
                 if (next_dot[1] == '.')
                         return -1;