CVE-2026-28730 is a null pointer dereference vulnerability affecting some versions of Hyperscan prior to v5.4.2.1. This flaw exists in user-space applications (Ring 3) and may allow an unauthenticated, unprivileged local attacker to cause a denial of service. The vulnerability does not impact confidentiality or integrity but can significantly affect system availability. The attack complexity is low and requires no user interaction or special internal knowledge.