GHSA-95h4-w6j8-2rp8HighCVSS 7.5
Undertow MadeYouReset HTTP/2 DDoS Vulnerability
🔗 CVE IDs covered (1)
📋 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).
🎯 Affected products2
- maven/io.undertow:undertow-core:< 2.2.38.Final
- maven/io.undertow:undertow-core:>= 2.3.0.Alpha1, < 2.3.20.Final
🔗 References (26)
- https://nvd.nist.gov/vuln/detail/CVE-2025-9784
- https://access.redhat.com/security/cve/CVE-2025-9784
- https://bugzilla.redhat.com/show_bug.cgi?id=2392306
- https://github.com/undertow-io/undertow/pull/1778
- https://issues.redhat.com/browse/UNDERTOW-2598
- https://github.com/undertow-io/undertow/pull/1802
- https://github.com/undertow-io/undertow/pull/1803
- https://github.com/undertow-io/undertow/pull/1804
- https://github.com/undertow-io/undertow/pull/1805
- https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
- https://access.redhat.com/errata/RHSA-2025:23143
- https://kb.cert.org/vuls/id/767506
- https://access.redhat.com/errata/RHSA-2026:0384
- https://access.redhat.com/errata/RHSA-2026:0386
- https://www.kb.cert.org/vuls/id/767506
- https://access.redhat.com/errata/RHSA-2026:0383
- https://access.redhat.com/errata/RHSA-2026:3892
- https://access.redhat.com/errata/RHSA-2026:3891
- https://access.redhat.com/errata/RHSA-2026:3889
- https://access.redhat.com/errata/RHSA-2026:4924
- https://access.redhat.com/errata/RHSA-2026:4917
- https://access.redhat.com/errata/RHSA-2026:4916
- https://access.redhat.com/errata/RHSA-2026:4915
- https://access.redhat.com/errata/RHSA-2026:33372
- https://access.redhat.com/errata/RHSA-2026:33371
- https://github.com/advisories/GHSA-95h4-w6j8-2rp8