Bug 2443260 (CVE-2026-28367) - CVE-2026-28367 undertow: Undertow: Request smuggling via `\r\r\r` as a header block terminator
Summary: CVE-2026-28367 undertow: Undertow: Request smuggling via `\r\r\r` as a header...
Keywords:
Status: NEW
Alias: CVE-2026-28367
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-27 04:44 UTC by OSIDB Bzimport
Modified: 2026-06-10 20:27 UTC (History)
50 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:25125 0 None None None 2026-06-10 20:27:10 UTC
Red Hat Product Errata RHSA-2026:25126 0 None None None 2026-06-10 20:25:08 UTC

Description OSIDB Bzimport 2026-02-27 04:44:46 UTC 
Undertow allows `\r\r\r` as a header block terminator. This can be used for request smuggling with proxy servers that forwards this byte sequence, including older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer.
Comment 2 errata-xmlrpc 2026-06-10 20:25:05 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1

Via RHSA-2026:25126 https://access.redhat.com/errata/RHSA-2026:25126
Comment 3 errata-xmlrpc 2026-06-10 20:27:07 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

Via RHSA-2026:25125 https://access.redhat.com/errata/RHSA-2026:25125
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