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CVE-2026-28367high8.7

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

Impact

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.

Source excerpt · redhat

What to do

To mitigate this vulnerability, configure any proxy servers positioned in front of Undertow to strictly validate HTTP header terminations. Ensure that these proxies are configured to reject or normalize non-standard header block terminators, such as \r\r\r, before forwarding requests to Undertow. This operational control helps prevent request smuggling attacks by ensuring that only properly formed HTTP requests reach the Undertow server.

redhat guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1.6

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

2.3.24.SP2-redhat-00001 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

0:2.40.0-7.redhat_00015.1.el8eap → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

0:801.6.1-1.GA_redhat_00001.1.el8eap → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

0:2.3.24-3.SP2_redhat_00001.1.el8eap → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

0:8.1.6-7.GA_redhat_00010.1.el8eap → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

0:2.40.0-7.redhat_00015.1.el9eap → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

0:801.6.1-1.GA_redhat_00001.1.el9eap → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

0:2.3.24-3.SP2_redhat_00001.1.el9eap → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

0:8.1.6-7.GA_redhat_00010.1.el9eap → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9

Red Hat · redhat

Red Hat build of Apache Camel for Spring Boot 4

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:camel_spring_boot:4

Red Hat · redhat

Red Hat build of Apache Camel - HawtIO 4

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:apache_camel_hawtio:4

Red Hat · redhat

Red Hat Data Grid 8

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_data_grid:8

Red Hat · redhat

Red Hat Enterprise Linux 10

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:10

Red Hat · redhat

Red Hat Enterprise Linux 8

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat Enterprise Linux 8

0 ranges
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat Enterprise Linux 9

0 ranges
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:9

Red Hat · redhat

Red Hat Fuse 7

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_fuse:7

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 7

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:7

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_application_platform:8

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform Expansion Pack

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jbosseapxp

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform Expansion Pack

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jbosseapxp

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform Expansion Pack

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:jbosseapxp

Red Hat · redhat

Red Hat Process Automation 7

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:jboss_enterprise_bpms_platform:7

Red Hat · redhat

Red Hat Single Sign-On 7

0 ranges
redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:red_hat_single_sign_on:7

Original source 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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-28367

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-444 ↗

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

redhat

Related →
Contributing organizations · 2
redhat

Assigning organization

2026-10-30
CISA-ADP

Additional data publisher

2026-03-31

What changed

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Large field values are marked as truncated previews. Original source snapshots remain retained.

References

4 sources
access.redhat.com/errata/RHSA-2026:25125
vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:25126
vendor-advisoryredhat
access.redhat.com/security/cve/CVE-2026-28367
vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi
issue-trackingredhat