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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 29, 2026 Sources: CVE List NVDCWE-444
8.7HIGH
NVD MITRE
EPSS Score
0.7%
Top 51.3%
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.

No summary for this CVE yet.

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
commercial·USaka redhat
Red Hat JBoss Enterprise Application Platform 8.1On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9On-prem
Operating Systems / linux-distro
Red Hat build of Apache Camel for Spring Boot 4LibraryLibrary
OSS Libraries / generic-library
Red Hat build of Apache Camel - HawtIO 4LibraryLibrary
OSS Libraries / generic-library
Red Hat Data Grid 8On-premDatabase
Databases / cache-message-queue
Red Hat Enterprise Linux 10On-premOS
Operating Systems / linux-distro
Red Hat Fuse 7On-premDev Tool
DevTools & CI / ci-cd
and 16 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
Scannable·OpenVAS
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Attack Graph

Products CVE Techniques Tactics

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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 →
News mentions
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