{"id":"CVE-2025-9784","summary":"Undertow: undertow madeyoureset http/2 ddos vulnerability","details":"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).","aliases":["GHSA-95h4-w6j8-2rp8"],"modified":"2026-09-06T03:30:17.429258683Z","published":"2025-09-02T13:37:59.772Z","database_specific":{"cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/9xxx/CVE-2025-9784.json","cna_assigner":"redhat"},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/"},{"type":"WEB","url":"https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final"},{"type":"WEB","url":"https://issues.redhat.com/browse/UNDERTOW-2598"},{"type":"WEB","url":"https://kb.cert.org/vuls/id/767506"},{"type":"WEB","url":"https://www.kb.cert.org/vuls/id/767506"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2025:23143"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:0383"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:0384"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:0386"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33371"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33372"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3889"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3891"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3892"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4915"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4916"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4917"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:4924"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2025-9784"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/9xxx/CVE-2025-9784.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-9784"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2392306"},{"type":"FIX","url":"https://github.com/undertow-io/undertow/pull/1778"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/undertow-io/undertow","events":[{"introduced":"0"},{"fixed":"6267eb1328fa08d996cbf3643b91253310fc9dd6"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.2.38.Final"}]}}],"versions":["2.2.37.Final","2.2.36.Final","2.2.35.Final","2.2.34.Final","2.2.33.Final","2.2.32.Final","2.2.31.Final","2.2.30.Final","2.2.28.Final","2.2.27.Final","2.2.26.Final","2.2.25.Final","2.2.24.Final","2.2.23.Final","2.2.22.Final","2.2.21.Final","2.2.20.Final","2.2.19.Final","2.2.18.Final","2.2.17.Final","2.2.16.Final","2.2.15.Final","2.2.14.Final","2.2.13.Final","2.2.12.Final","2.2.11.Final","2.2.10.Final","2.2.9.Final","2.2.8.Final","2.2.7.Final","2.2.6.Final","2.2.5.Final","2.2.3.Final","2.2.4.Final","2.2.2.Final","2.1.4.Final","2.2.1.Final","2.2.0.Final","2.1.3.Final","2.1.2.Final","2.1.1.Final","2.1.0.Final","2.0.29.Final","2.0.28.Final","2.0.27.Final","2.0.26.Final","2.0.25.Final","2.0.24.Final","2.0.23.Final","2.0.22.Final","2.0.21.Final","2.0.20.Final","2.0.17.Final","2.0.16.Final","2.0.15.Final","2.0.14.Final","2.0.13.Final","2.0.12.Final","2.0.11.Final","2.0.10.Final","2.0.9.Final","2.0.8.Final","2.0.7.Final","2.0.6.Final","2.0.5.Final","2.0.4.Final","2.0.3.Final","2.0.2.Final","2.0.1.Final","2.0.0.Final","2.0.0.Beta1","2.0.0.Alpha1","1.3.3.Final","1.3.2.Final","1.3.1.Final","1.3.0.Final","1.3.0.CR3","1.3.0.CR2","1.3.0.CR1","1.3.0.Beta13","1.3.0.Beta12","1.3.0.Beta11","1.3.0.Beta10","1.3.0.Beta9","1.3.0.Beta8","1.3.0.Beta7","1.3.0.Beta6","1.3.0.Beta5","1.3.0.Beta4","1.3.0.Beta3","1.3.0.Beta2","1.3.0.Beta1","1.2.4.Final","1.2.3.Final","1.2.2.Final","1.2.1.Final","1.2.0.Final","1.2.0.CR1","1.2.0.Beta10","1.2.0.Beta9","1.2.0.Beta8","1.2.0.Beta7","1.2.0.Beta6","1.2.0.Beta5","1.2.0.Beta4","1.2.0.Beta3","1.2.0.Beta2","1.2.0.Beta1","1.1.0.Beta8","1.1.0.Beta7","1.1.0.Beta6","1.1.0.Beta5","1.1.0.Beta4","1.1.0.Beta3","1.1.0.Beta2","1.1.0.Beta1","1.0.3.Final","1.0.2.Final","1.0.1.Final","1.0.0.Final","1.0.0.CR4","1.0.0.CR3","1.0.0.CR2","1.0.0.CR1","1.0.0.Beta33","1.0.0.Beta32","1.0.0.Beta31","1.0.0.Beta30","1.0.0.Beta29","1.0.0.Beta28","1.0.0.Beta27","1.0.0.Beta26","1.0.0.Beta25","1.0.0.Beta24","1.0.0.Beta23","1.0.0.Beta22","1.0.0.Beta21","1.0.0.Beta20","1.0.0.Beta19","1.0.0.Beta18","1.0.0.Beta17","1.0.0.Beta16","1.0.0.Beta15","1.0.0.Beta14","1.0.0.Beta13","1.0.0.Beta12","1.0.0.Beta11","1.0.0.Beta10","1.0.0.Beta9","1.0.0.Beta8","1.0.0.Beta7","1.0.0.Beta6","1.0.0.Beta5","1.0.0.Beta4","1.0.0.Beta3","1.0.0.Beta2","1.0.0.Beta1","1.0.0.Alpha22","1.0.0.Alpha21","1.0.0.Alpha20","1.0.0.Alpha19","1.0.0.Alpha18","1.0.0.Alpha17","1.0.0.Alpha16","1.0.0.Alpha15","1.0.0.Alpha14","1.0.0.Alpha13","1.0.0.Alpha12","1.0.0.Alpha11","1.0.0.Alpha10","1.0.0.Alpha9","1.0.0.Alpha8","1.0.0.Alpha7","1.0.0.Alpha6","1.0.0.Alpha5","1.0.0.Alpha4","1.0.0.Alpha3","1.0.0.Alpha2","1.0.0.Alpha1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-9784.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}