{"cve":"CVE-2026-28369","nvd":{"published":"2026-03-27T17:16:28.240","modified":"2026-10-14T17:18:27.550","status":"Modified","description":"A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure.","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-2026-28369","https://bugzilla.redhat.com/show_bug.cgi?id=2443262"],"products":["redhat:build_of_apache_camel_-_hawtio","redhat:build_of_apache_camel_for_spring_boot","redhat:data_grid","redhat:enterprise_linux","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":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-28369","score":0.00689,"percentile":0.52479,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-vqqj-9cmv-hx43","url":"https://osv.dev/vulnerability/GHSA-vqqj-9cmv-hx43","summary":"Undertow is Vulnerable to HTTP Request/Response Smuggling","modified":"2026-09-10T03:51:00.838531065Z","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."]}