{"id":"CVE-2026-28367","aliases":["DEBIAN-CVE-2026-28367","EUVD-2026-16694","GHSA-3gv6-g396-9v4r","RHSA-2026:25125","UBUNTU-CVE-2026-28367"],"status":"published","title":"Undertow: undertow: request smuggling via `\\r\\r\\r` as a header block terminator","description":"A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\\r\\r\\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web requests.","severity":{"version":"3.1","score":8.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00719,"percentile":0.54145,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2026-03-27T16:13:05Z","modified":"2026-11-05T09:47:27Z","fixes":[{"ecosystem":"Maven","package":"io.undertow:undertow-core","fixed_in":["2.3.25.Final","2.2.40.Final"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"io.undertow:undertow-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.0.Final"},{"fixed":"2.3.25.Final"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"io.undertow:undertow-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.40.Final"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.11-1","1.3.16-1","1.3.19-1","1.3.21-1","1.3.23-1","1.3.4-1","1.3.5-1","1.3.7-1","1.4.0-1","1.4.1-1","1.4.18-1","1.4.20-1","1.4.21-1","1.4.21-2","1.4.22-1","1.4.23-1","1.4.23-2","1.4.23-3","1.4.25-1","1.4.25-2","1.4.3-1","1.4.4-1","1.4.6-1","1.4.7-1","1.4.8-1","2.0.23-1","2.0.25-1","2.0.26-1","2.0.27-1","2.0.28-1","2.0.29-1","2.0.30-1","2.1.0-1","2.1.1-1","2.1.3-1","2.2.0-1","2.2.10-1","2.2.12-1","2.2.13-1","2.2.14-1","2.2.16-1","2.2.17-1","2.2.18-1","2.2.19-1","2.2.2-1","2.2.20-1","2.2.21-1","2.2.3-1","2.2.4-1","2.2.5-1","2.2.8-1","2.3.18-1","2.3.18-2","2.3.20-1","2.3.8-1","2.3.8-2"]},{"source":"osv","ecosystem":"Maven","package":"io.undertow:undertow-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.0.Final"},{"fixed":"2.3.25.Final"}]}],"versions":["2.3.0.Final","2.3.1.Final","2.3.10.Final","2.3.11.Final","2.3.12.Final","2.3.13.Final","2.3.14.Final","2.3.15.Final","2.3.16.Final","2.3.17.Final","2.3.18.Final","2.3.19.Final","2.3.2.Final","2.3.20.Final","2.3.21.Final","2.3.22.Final","2.3.23.Final","2.3.24.Final","2.3.3.Final","2.3.4.Final","2.3.5.Final","2.3.6.Final","2.3.7.Final","2.3.8.Final","2.3.9.Final"]},{"source":"osv","ecosystem":"Maven","package":"io.undertow:undertow-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.40.Final"}]}],"versions":["1.0.0.Alpha1","1.0.0.Alpha10","1.0.0.Alpha11","1.0.0.Alpha12","1.0.0.Alpha13","1.0.0.Alpha14","1.0.0.Alpha15","1.0.0.Alpha16","1.0.0.Alpha17","1.0.0.Alpha18","1.0.0.Alpha19","1.0.0.Alpha2","1.0.0.Alpha20","1.0.0.Alpha21","1.0.0.Alpha22","1.0.0.Alpha3","1.0.0.Alpha4","1.0.0.Alpha5","1.0.0.Alpha6","1.0.0.Alpha7","1.0.0.Alpha8","1.0.0.Alpha9","1.0.0.Beta1","1.0.0.Beta10","1.0.0.Beta11","1.0.0.Beta12","1.0.0.Beta13","1.0.0.Beta14","1.0.0.Beta15","1.0.0.Beta16","1.0.0.Beta17","1.0.0.Beta18","1.0.0.Beta19","1.0.0.Beta2","1.0.0.Beta20","1.0.0.Beta21","1.0.0.Beta22","1.0.0.Beta23","1.0.0.Beta24","1.0.0.Beta25","1.0.0.Beta26","1.0.0.Beta27","1.0.0.Beta28","1.0.0.Beta29","1.0.0.Beta3","1.0.0.Beta30","1.0.0.Beta31","1.0.0.Beta32","1.0.0.Beta33","1.0.0.Beta4","1.0.0.Beta5","1.0.0.Beta6","1.0.0.Beta7","1.0.0.Beta8","1.0.0.Beta9","1.0.0.CR1","1.0.0.CR2","1.0.0.CR3","1.0.0.CR4","1.0.0.CR5","1.0.0.Final","1.0.1.Final","1.0.10.Final","1.0.11.Final","1.0.12.Final","1.0.13.Final","1.0.14.Final","1.0.15.Final","1.0.16.Final","1.0.17.Final","1.0.18.Final","1.0.19.Final","1.0.2.Final","1.0.3.Final","1.0.4.Final","1.0.5.Final","1.0.6.Final","1.0.7.Final","1.0.8.Final","1.0.9.Final","1.1.0.Beta1","1.1.0.Beta2","1.1.0.Beta3","1.1.0.Beta4","1.1.0.Beta5","1.1.0.Beta6","1.1.0.Beta7","1.1.0.Beta8","1.1.0.CR1","1.1.0.CR2","1.1.0.CR3","1.1.0.CR4","1.1.0.CR5","1.1.0.CR6","1.1.0.CR7","1.1.0.CR8","1.1.0.Final","1.1.1.Final","1.1.2.Final","1.1.3.Final","1.1.4.Final","1.1.5.Final","1.1.6.Final","1.1.7.Final","1.1.8.Final","1.1.9.Final","1.2.0.Beta1","1.2.0.Beta10","1.2.0.Beta2","1.2.0.Beta3","1.2.0.Beta4","1.2.0.Beta5","1.2.0.Beta6","1.2.0.Beta7","1.2.0.Beta8","1.2.0.Beta9","1.2.0.CR1","1.2.0.Final","1.2.1.Final","1.2.10.Final","1.2.11.Final","1.2.12.Final","1.2.2.Final","1.2.3.Final","1.2.4.Final","1.2.5.Final","1.2.6.Final","1.2.7.Final","1.2.8.Final","1.2.9.Final","1.3.0.Beta1","1.3.0.Beta10","1.3.0.Beta11","1.3.0.Beta12","1.3.0.Beta13","1.3.0.Beta2","1.3.0.Beta3","1.3.0.Beta4","1.3.0.Beta5","1.3.0.Beta6","1.3.0.Beta7","1.3.0.Beta8","1.3.0.Beta9","1.3.0.CR1","1.3.0.CR2","1.3.0.CR3","1.3.0.Final","1.3.1.Final","1.3.10.Final","1.3.11.Final","1.3.12.Final","1.3.13.Final","1.3.14.Final","1.3.15.Final","1.3.16.Final","1.3.17.Final","1.3.18.Final","1.3.19.Final","1.3.2.Final","1.3.20.Final","1.3.21.Final","1.3.22.Final","1.3.23.Final","1.3.24.Final","1.3.25.Final","1.3.26.Final","1.3.27.Final","1.3.28.Final","1.3.29.Final","1.3.3.Final","1.3.30.Final","1.3.31.Final","1.3.32.Final","1.3.33.Final","1.3.4.Final","1.3.5.Final","1.3.6.Final","1.3.7.Final","1.3.8.Final","1.3.9.Final","1.4.0.Beta1","1.4.0.CR1","1.4.0.CR2","1.4.0.CR3","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