GHSA-VGRC-HQ28-P3XP Hysteria has an authenticated UDP ACL bypass that enables localhost and private-network UDP SSRF

Summary Hysteria's UDP relay treats the destination address as packet-scoped, but ACL and outbound policy are applied only once when a new UDP session is created. After an authenticated client opens a UDP session using an allowed first destination, later packets in the same Session ID can be sent...