bool RenderMenuList::itemIsLabel(unsigned listIndex) const
{
    const Vector<HTMLElement*>& listItems = toHTMLSelectElement(node())->listItems();
    return listIndex < listItems.size() && listItems[listIndex]->hasTagName(optgroupTag);
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.