Description
A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fails to properly validate the Host header in incoming HTTP requests.As a result, requests containing malformed or malicious Host headers are processed without rejection, enabling attackers to poison caches, perform internal network scans, or hijack user sessions.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Red Hat Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11
Default version status: unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7
Default version status: affected
0:1.4.18-21.SP19_redhat_00001.1.ep7.el7 to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7
Default version status: affected
0:2.0.41-8.SP9_redhat_00001.1.el7eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.4.24
Default version status: affected
2.2.39.Final-redhat-00001 to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
Default version status: affected
0:2.2.39-1.Final_redhat_00001.1.el7eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
Default version status: affected
0:7.4.24-4.GA_redhat_00002.1.el7eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
Default version status: affected
0:2.2.39-1.Final_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
Default version status: affected
0:7.4.24-4.GA_redhat_00002.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
Default version status: affected
0:2.2.39-1.Final_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
Default version status: affected
0:7.4.24-4.GA_redhat_00002.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0
Default version status: unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
Default version status: affected
0:1.83.0-1.redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
Default version status: affected
0:33.0.0-2.jre_redhat_00003.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
Default version status: affected
0:4.0.6-1.redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
Default version status: affected
0:1.0.0-3.redhat_00009.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
Default version status: affected
0:2.0.2-1.Final_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
Default version status: affected
0:2.3.23-1.SP3_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
Default version status: affected
0:1.83.0-1.redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
Default version status: affected
0:33.0.0-2.jre_redhat_00003.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
Default version status: affected
0:4.0.6-1.redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
Default version status: affected
0:1.0.0-3.redhat_00009.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
Default version status: affected
0:2.0.2-1.Final_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
Default version status: affected
0:2.3.23-1.SP3_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.3
Default version status: affected
2.3.20.SP4-redhat-00001 to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:4.0.10-1.redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:1.82.0-1.redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:801.3.0-1.GA_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:1.0.1-3.redhat_00003.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:6.6.36-1.Final_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:4.0.2-1.Final_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:2.5.0-1.redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:2.3.20-2.SP4_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:8.1.3-4.GA_redhat_00006.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:5.0.12-1.Final_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:2.6.6-1.Final_redhat_00001.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
Default version status: affected
0:8.1.1-4.GA_redhat_00007.1.el8eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:4.0.10-1.redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:1.82.0-1.redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:801.3.0-1.GA_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:1.0.1-3.redhat_00003.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:6.6.36-1.Final_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:4.0.2-1.Final_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:2.5.0-1.redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:2.3.20-2.SP4_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:8.1.3-4.GA_redhat_00006.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:5.0.12-1.Final_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:2.6.6-1.Final_redhat_00001.1.el9eap to < *unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
Default version status: affected
0:8.1.1-4.GA_redhat_00007.1.el9eap to < *unaffected
Red Hat Red Hat Single Sign-On 7.6.13
Default version status: unaffected
Red Hat Red Hat Single Sign-On 7.6 for RHEL 7
Default version status: affected
0:18.0.20-1.redhat_00001.1.el7sso to < *unaffected
Red Hat Red Hat Single Sign-On 7.6 for RHEL 8
Default version status: affected
0:18.0.20-1.redhat_00001.1.el8sso to < *unaffected
Red Hat Red Hat Single Sign-On 7.6 for RHEL 9
Default version status: affected
0:18.0.20-1.redhat_00001.1.el9sso to < *unaffected
Red Hat RHEL-8 based Middleware Containers
Default version status: affected
7.6-85 to < *unaffected
Red Hat Red Hat build of Apache Camel - HawtIO 4
Default version status: unaffected
Red Hat Red Hat Data Grid 8
Default version status: affected
Red Hat Red Hat Enterprise Linux 10
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 8
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 8
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 9
Default version status: unaffected
Red Hat Red Hat Fuse 7
Default version status: affected
Red Hat Red Hat JBoss Enterprise Application Platform 7
Default version status: affected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
Default version status: affected
Red Hat Red Hat Process Automation 7
Default version status: affected
References
- https://access.redhat.com/errata/RHSA-2026:0383 ↗
- https://access.redhat.com/errata/RHSA-2026:0384 ↗
- https://access.redhat.com/errata/RHSA-2026:0386 ↗
- https://access.redhat.com/errata/RHSA-2026:33371 ↗
- https://access.redhat.com/errata/RHSA-2026:33372 ↗
- https://access.redhat.com/errata/RHSA-2026:3889 ↗
- https://access.redhat.com/errata/RHSA-2026:3890 ↗
- https://access.redhat.com/errata/RHSA-2026:3891 ↗
- https://access.redhat.com/errata/RHSA-2026:3892 ↗
- https://access.redhat.com/errata/RHSA-2026:4915 ↗
- https://access.redhat.com/errata/RHSA-2026:4916 ↗
- https://access.redhat.com/errata/RHSA-2026:4917 ↗
- https://access.redhat.com/errata/RHSA-2026:4924 ↗
- https://access.redhat.com/errata/RHSA-2026:76128 ↗
- https://access.redhat.com/errata/RHSA-2026:76129 ↗
- https://access.redhat.com/errata/RHSA-2026:76130 ↗
- https://access.redhat.com/errata/RHSA-2026:76132 ↗
- https://access.redhat.com/errata/RHSA-2026:76134 ↗
- https://access.redhat.com/security/cve/CVE-2025-12543 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2408784 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-12543.json ↗