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CVE-2026-28369

Undertow: undertow: request smuggling via malformed http request headers

Published: Mar 27, 2026Updated: Jul 22, 2026 Sources: CVE List NVDCWE-444
8.7HIGH
NVD MITRE
EPSS Score
0.7%
Top 51.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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.

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 17 more affected products View all →

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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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-2026-28369
access.redhat.com
and 1 more references View all →

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