CVE-2026-28369

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.

• CWE-444

• https://access.redhat.com/errata/RHSA-2026:25125
• https://access.redhat.com/errata/RHSA-2026:25126
• https://access.redhat.com/security/cve/CVE-2026-28369Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2443262Issue Tracking, Vendor Advisory

Published

Mar 27, 2026

Last Modified

Jul 22, 2026

Status

Modified

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