diff --git a/dnsmasq-2.77-CVE-2017-14493.patch b/dnsmasq-2.77-CVE-2017-14493.patch
new file mode 100644
index 0000000..d80553c
--- /dev/null
+++ b/dnsmasq-2.77-CVE-2017-14493.patch
@@ -0,0 +1,30 @@
+From 3d4ff1ba8419546490b464418223132529514033 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Mon, 25 Sep 2017 18:52:50 +0100
+Subject: [PATCH 4/9] Security fix, CVE-2017-14493, DHCPv6 - Stack buffer
+ overflow.
+
+Fix stack overflow in DHCPv6 code. An attacker who can send
+a DHCPv6 request to dnsmasq can overflow the stack frame and
+crash or control dnsmasq.
+---
+ src/rfc3315.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/rfc3315.c b/src/rfc3315.c
+index 1687931..920907c 100644
+--- a/src/rfc3315.c
++++ b/src/rfc3315.c
+@@ -206,6 +206,9 @@ static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz,
+   /* RFC-6939 */
+   if ((opt = opt6_find(opts, end, OPTION6_CLIENT_MAC, 3)))
+     {
++      if (opt6_len(opt) - 2 > DHCP_CHADDR_MAX) {
++        return 0;
++      }
+       state->mac_type = opt6_uint(opt, 0, 2);
+       state->mac_len = opt6_len(opt) - 2;
+       memcpy(&state->mac[0], opt6_ptr(opt, 2), state->mac_len);
+-- 
+2.9.5
+
diff --git a/dnsmasq.spec b/dnsmasq.spec
index 150234e..9583493 100644
--- a/dnsmasq.spec
+++ b/dnsmasq.spec
@@ -25,6 +25,7 @@ Source1:        %{name}.service
 Patch1:         dnsmasq-2.77-CVE-2017-13704.patch
 Patch2:         dnsmasq-2.77-CVE-2017-14491.patch
 Patch3:         dnsmasq-2.77-CVE-2017-14492.patch
+Patch4:         dnsmasq-2.77-CVE-2017-14493.patch
 
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
@@ -62,6 +63,7 @@ query/remove a DHCP server's leases.
 %patch1 -p1 -b .CVE-2017-13704
 %patch2 -p1 -b .CVE-2017-14491
 %patch3 -p1 -b .CVE-2017-14492
+%patch4 -p1 -b .CVE-2017-14493
 
 # use /var/lib/dnsmasq instead of /var/lib/misc
 for file in dnsmasq.conf.example man/dnsmasq.8 man/es/dnsmasq.8 src/config.h; do
@@ -149,8 +151,9 @@ rm -rf $RPM_BUILD_ROOT
 
 %changelog
 * Mon Oct 02 2017 Petr Menšík <pemensik@redhat.com> - 2.77-8
-- Security fix, CVE-2017-14491 DNS heap buffer overflow
-- Security fix, CVE-2017-14492 DHCPv6 RA heap overflow
+- Security fix, CVE-2017-14491, DNS heap buffer overflow
+- Security fix, CVE-2017-14492, DHCPv6 RA heap overflow
+- Security fix, CVE-2017-14493, DHCPv6 - Stack buffer overflow
 
 * Thu Sep 14 2017 Petr Menšík <pemensik@redhat.com> - 2.77-7
 - Fix CVE-2017-13704