Launch Week Day 1: Announcing Security Design Review
HIGH 7.5 Maven

Undertow MadeYouReset HTTP/2 DDoS Vulnerability

GHSA-95h4-w6j8-2rp8 · CVE-2025-9784

Published · Modified

Description

A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the "MadeYouReset" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakness that can be exploited to cause a denial of service (DoS).

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