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8.7 High

CVE-2026-28367 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.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
High
Privileges required
None
Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

Affected products and versions

Product Affected versions Fixed in
Red Hat build of Apache Camel for Spring Boot 4 Versions not published
Red Hat build of Apache Camel - HawtIO 4 Versions not published
Red Hat Data Grid 8 Versions not published
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Fuse 7 Versions not published
Red Hat JBoss Enterprise Application Platform 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8 Versions not published
Show the 8 other branches
Product Affected versions Fixed in
Red Hat JBoss Enterprise Application Platform Expansion Pack Versions not published
Red Hat Process Automation 7 Versions not published
Red Hat Single Sign-On 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1.7.GA 2.3 earliest → < 2.3.24.SP3-redhat-00001 2.3.24.SP3-redhat-00001
Red Hat JBoss Enterprise Application Platform 8.1.6 2.3 earliest → < 2.3.24.SP2-redhat-00001 2.3.24.SP2-redhat-00001

Other CVEs of Red Hat build of Apache Camel for Spring Boot 4

The 106 CVEs of Red Hat build of Apache Camel for Spring Boot 4 →
CVE-2026-91920 Undertow: undertow: chunkreader message length permits chunk-size overflow 6.5 Medium CVE-2026-114370 Undertow: undertow: pathresourcemanager safepaths check allows sibling-directory symlink traversal 3.7 Low CVE-2026-93562 Io.netty/netty-codec-http: netty: incomplete validation of malformed transfer-encoding allows http request smuggling 6.5 Medium CVE-2026-93574 Io.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsing 6.5 Medium
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