This is adding to shipping costs and transit times as ships have to go around South Africa to avoid the missiles.

The screenshot captured from a video released by Yemen’s Houthi group on June 26, 2024 shows that a hypersonic missile is launched from an undisclosed desert area in Yemen. Xinhua
The Houthis are disrupting global trade and if they have hypersonic missile capability, it only makes the situation worse.
by Mike Whitney at unz.com:
Is this Iran’s revenge?
Is this how Iran pays-back Israel for bombing its consulate in Damascus in late March; by providing the Houthis with hypersonic missiles to fight the “Great Satan” [the USA]?
On June 26, Yemen’s Houthi rebels launched an attack on a commercial ship in the Arabian Sea using a long-range, solid-fuel hypersonic ballistic missile. It was the first time the group had used the state-of-the-art missile in its military operations. The significance of the development cannot be overstated. Hypersonic missiles—which feature technological advances that are still unavailable in the West—are more accurate, harder to shoot down, and travel longer distances than earlier models. These unique, cutting-edge weapons are a force-multiplier that give the Houthis a decided advantage in future attacks in the Red Sea and beyond. They will allow the Houthis to tighten their grip on commercial traffic while putting US warships at greater risk. They will also significantly improve the Houthis chances of prevailing in their war with the United States and its coalition partners. This is from an article at the Maritime Executive:
The Houthis…. are asserting that they have launched for the first time a hypersonic missile which was used to target an MSC containership far out in the Gulf of Aden….
For the first time, the identity of the missile that targeted the… MSC Sarah V in the Arabian Sea,” was being revealed according to a posting by the Houthi spokesperson Yahya Saree. “It is a locally made hypersonic missile that possesses advanced technology, is accurate in hitting, and reaches long ranges.”…
Media reports in March said the Houthis had begun manufacturing their hypersonic missile… capable of reaching Mach 8. The reports said it would be used to threaten shipping further into the Indian Ocean. Video: Houthis Claim First Launch of Hypersonic Missile Targeting MSC Ship, Maritime Executive
First of all, the Houthis do not have advanced missile production facilities, so whatever hybrid ballistic missile they are presently using in their military operations, they did not manufacture it themselves.
Secondly, experts suggest that the missile that was fired in the Arabian Sea incident earlier in the week was probably a version of the Iranian-made Fattah-1, which can travel at speeds of up to Mach 3 or three times the speed of sound. The Fattah-1 represents a significant upgrade from the missiles the Houthis have been using, but they do not pose the same grave threat to commercial shipping as advanced, cutting edge hypersonic ballistic missiles. State-of-the-art solid-fuel hypersonic missiles are in a class of their own. Some of them travel at speeds that exceed Mach 5 and are highly maneuverable and able to change course during flight. Here’s some background:
The ability to launch highly maneuverable weapons at hypersonic speeds gives any country a considerable advantage, because such weapons can evade just about any defense system currently in use.
“It doesn’t matter what the threat is. If you can’t see it, you can’t defend against it,” General John Hyten, the former vice chairman of the U.S. Joint Chiefs of Staff, told an audience in Washington in January 2020.
As the commander of U.S. Strategic Command in 2018, Hyten said, “We don’t have any defense that could deny the deployment of such a weapon against us. … Our defense is deterrent capability.” What Are Hypersonic Weapons and Who Has Them?, VOA

Bottom line: If the Houthis had these “advanced” weapons at their disposal, the Red Sea would be littered with smoldering US warships headed for Davy Jones locker. But that isn’t the case, so we have to assume that—who ever is supplying the Houthis—is not yet prepared to give them their top-of-the-line hypersonic missiles.