diff --git a/src/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c
index 3f4af8440e..0b3904c02a 100644
--- a/src/libsystemd-network/sd-dhcp-server.c
+++ b/src/libsystemd-network/sd-dhcp-server.c
@@ -296,6 +296,9 @@ static int dhcp_server_send_unicast_raw(sd_dhcp_server *server,
 
         memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN);
 
+        if (len > UINT16_MAX)
+                return -EOVERFLOW;
+
         dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER,
                                       packet->dhcp.yiaddr,
                                       DHCP_PORT_CLIENT, len, -1);
diff --git a/test/fuzz/fuzz-dhcp-server-relay-message/clusterfuzz-testcase-minimized-fuzz-dhcp-server-relay-message-4972399731277824 b/test/fuzz/fuzz-dhcp-server-relay-message/clusterfuzz-testcase-minimized-fuzz-dhcp-server-relay-message-4972399731277824
new file mode 100644
index 0000000000..e902b6989b
Binary files /dev/null and b/test/fuzz/fuzz-dhcp-server-relay-message/clusterfuzz-testcase-minimized-fuzz-dhcp-server-relay-message-4972399731277824 differ