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 for RHEL 8, Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9, Red Hat build of Apache Camel for Spring Boot 4.
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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; 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.
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 19 days ago·verify at source
- undertow-core
- 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 19 days ago·verify at source
Mitigation
Upgrade to a fixed release: undertow-core, 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 additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
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