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Advisory severityHigh8.7Red Hat Linux

High [CVE-2026-28369] request smuggling via malformed http request headers

This high-severity Red Hat Linux advisory covers CVE-2026-28369 affecting Red Hat JBoss Enterprise Application Platform 8.1.6, Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8, Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-28369 Source published Source updated

VulniPulse record published

CVE-2026-28369
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Summary

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.

Red Hat severity: Important — CVSS 8.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N). Weakness: CWE-444.

Affected Red Hat products: Red Hat JBoss Enterprise Application Platform 8.1.6; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9; Red Hat build of Apache Camel for Spring Boot 4; Red Hat Data Grid 8; Red Hat Enterprise Linux 9; Red Hat Fuse 7; Red Hat JBoss Enterprise Application Platform 7; Red Hat JBoss Enterprise Application Platform 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Process Automation 7; Red Hat Single Sign-On 7.

Will not fix / out of support: Red Hat Data Grid 8; Red Hat Fuse 7; Red Hat JBoss Enterprise Application Platform 7; Red Hat Process Automation 7. Red Hat fixing advisory: RHSA-2026:25126, RHSA-2026:25125.

Is CVE-2026-28369 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-28369 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-28369?

Upgrade to a fixed release named by Red Hat:

  • io.undertow/undertow-core:2.3.24.SP2-redhat-00001
  • eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el8eap
  • eap8-eap-product-conf-parent-0:801.6.1-1.GA_redhat_00001.1.el8eap
  • eap8-undertow-0:2.3.24-3.SP2_redhat_00001.1.el8eap
  • eap8-wildfly-0:8.1.6-7.GA_redhat_00010.1.el8eap
  • eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el9eap
  • eap8-eap-product-conf-parent-0:801.6.1-1.GA_redhat_00001.1.el9eap
  • eap8-undertow-0:2.3.24-3.SP2_redhat_00001.1.el9eap
  • eap8-wildfly-0:8.1.6-7.GA_redhat_00010.1.el9eap
  • RHSA-2026:25126
  • RHSA-2026:25125

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Fixed versions
  • io.undertow/undertow-core:2.3.24.SP2-redhat-00001
  • eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el8eap
  • eap8-eap-product-conf-parent-0:801.6.1-1.GA_redhat_00001.1.el8eap
  • eap8-undertow-0:2.3.24-3.SP2_redhat_00001.1.el8eap
  • eap8-wildfly-0:8.1.6-7.GA_redhat_00010.1.el8eap
  • eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el9eap
  • eap8-eap-product-conf-parent-0:801.6.1-1.GA_redhat_00001.1.el9eap
  • eap8-undertow-0:2.3.24-3.SP2_redhat_00001.1.el9eap
  • eap8-wildfly-0:8.1.6-7.GA_redhat_00010.1.el9eap
  • RHSA-2026:25126
  • RHSA-2026:25125

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Mitigation

Upgrade to a fixed release: io.undertow/undertow-core:2.3.24.SP2-redhat-00001, eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el8eap, eap8-eap-product-conf-parent-0:801.6.1-1.GA_redhat_00001.1.el8eap, eap8-undertow-0:2.3.24-3.SP2_redhat_00001.1.el8eap, eap8-wildfly-0:8.1.6-7.GA_redhat_00010.1.el8eap, eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el9eap. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

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