In many applications, the worst-case performance of hash tables is usually just a theoretical concern and maybe an occasional nuisance, but for servers that need to process untrusted input, this can be an attack vector. If an attacker manages to find a path that allows them to cause a large number of collisions in the server's internal hash table with a small number of inputs, they can effectively "freeze" the thread without much effort. And, with enough threads frozen, they could render the service unavailable for a sustained period of time. This is commonly called a hash flooding or Hash-DoS (Denial of Service) attack.
04:34, 4 апреля 2026Некролог
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