{"cve":"CVE-2026-28367","nvd":{"published":"2026-03-27T17:16:27.750","modified":"2026-10-26T00:10:00.150","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-444"],"references":["https://access.redhat.com/errata/RHSA-2026:25125","https://access.redhat.com/errata/RHSA-2026:25126","https://access.redhat.com/security/cve/CVE-2026-28367","https://bugzilla.redhat.com/show_bug.cgi?id=2443260"],"products":["redhat:build_of_apache_camel_-_hawtio","redhat:build_of_apache_camel_for_spring_boot","redhat:data_grid","redhat:fuse","redhat:jboss_enterprise_application_platform","redhat:jboss_enterprise_application_platform_expansion_pack","redhat:process_automation","redhat:single_sign-on","redhat:undertow"],"source":"nvd","synced_at":"2026-10-26T00:31:35.753532240+00:00"},"epss":{"cve":"CVE-2026-28367","score":0.00719,"percentile":0.53587,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-3gv6-g396-9v4r","url":"https://osv.dev/vulnerability/GHSA-3gv6-g396-9v4r","summary":"Undertow is Vulnerable to HTTP Request/Response Smuggling","modified":"2026-09-10T03:50:36.838358295Z","packages":[{"ecosystem":"Maven","name":"io.undertow:undertow-parent","purl":"pkg:maven/io.undertow/undertow-parent","ranges":["<=2.3.23.Final"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}