;Host&rdquo; header will cause a NULL pointer to be dereferenced and result in abnormal termination of the Envoy process.</p></article><nav class=pagenav><div class=left><a title="Istio 1.4.3 patch release." href=/v1.9/news/releases/1.4.x/announcing-1.4.3/><svg class="icon left-arrow"><use xlink:href="/v1.9/img/icons.svg#left-arrow"/></svg>1.4.3</a></div><div class=right><a title="Istio 1.4.1 patch release." href=/v1.9/news/releases/1.4.x/announcing-1.4.1/>1.4.1<svg class="icon right-arrow"><use xlink:href=