High [CVE-2026-28368] Undertow: undertow: request smuggling via inconsistent header parsing
This high-severity Red Hat Linux advisory covers CVE-2026-28368 affecting Red Hat JBoss Enterprise Application Platform 8.1.7.GA, 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.
VulniPulse record published
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies.
This discrepancy in header interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing unauthorized resources. This flaw in Undertow's header parsing logic allows for request smuggling attacks when Undertow is deployed behind an upstream proxy.
Crafted requests can bypass security controls by being interpreted differently by Undertow and the proxy, potentially leading to unauthorized access or cache poisoning. 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 8.1.7.GA; 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.
Affected products named by the advisory: Red Hat package: resteasy.
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 9 days ago·verify at source
- io.undertow/undertow-core:2.3.24.SP3-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 9 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.