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CVE-2026-28367

Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator

Published: Mar 27, 2026Updated: Jun 10, 2026 Sources: CVE List NVDCWE-444
NVD MITRE
8.7CVSSHIGH
EPSS Score
0.7%
Top 51.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-444

Affected Products

Red Hat JBoss Enterprise Application Platform 8.1Red Hat
On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat
On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat
On-prem
Operating Systems / linux-distro
Red Hat build of Apache Camel for Spring Boot 4Red Hat
On-prem
Operating Systems / linux-distro
Red Hat build of Apache Camel - HawtIO 4Red Hat
On-prem
Operating Systems / linux-distro
red hatcommercialUSOperating Systemsaka red hat
and 19 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:25125
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:25126
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-28367
access.redhat.com
and 1 more references View all →

Timeline

Published
Mar 27, 2026
Last Updated
Jun 10, 2026

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