# CVE-2025-12543: Undertow-core: undertow http server fails to reject malformed host headers leading to potential cache poisoning and ssrf

Status: published. Published: 2026-01-07. Updated: 2026-11-04.

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.

## Remediation

- workaround: 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, applicability, or stability. (source: CNA: redhat)
- fix: RHSA-2026:33372: Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 Server

RHSA-2026:33371: Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 Server

RHSA-2026:4915: Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server

RHSA-2026:4916: Red Hat JBoss EAP 7.4 ELS for RHEL 8

RHSA-2026:3889: Red Hat JBoss EAP 8.0 for RHEL 8

RHSA-2026:0383: Red Hat JBoss EAP 8.1 for RHEL 8

RHSA-2026:4917: Red Hat JBoss EAP 7.4 ELS for RHEL 9

RHSA-2026:3891: Red Hat JBoss EAP 8.0 for RHEL 9

RHSA-2026:0384: Red Hat JBoss EAP 8.1 for RHEL 9

RHSA-2026:4924: Red Hat JBoss Enterprise Application Platform 7.4.24

RHSA-2026:3892: Red Hat JBoss Enterprise Application Platform 8.0

RHSA-2026:0386: Red Hat JBoss Enterprise Application Platform 8.1.6

RHSA-2026:3890: Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11 (source: ADP: redhat-SADP)
- workaround: 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, applicability, or stability. (source: ADP: redhat-SADP)

## Affected products and versions

- Red Hat / Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 (eap7-undertow): ≥ 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 (eap7-undertow): ≥ 0:2.0.41-8.SP9_redhat_00001.1.el7eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4.24 (io.undertow/undertow-core): ≥ 2.2.39.Final-redhat-00001; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el7eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el7eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-bouncycastle): ≥ 0:1.83.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-guava-libraries): ≥ 0:33.0.0-2.jre_redhat_00003.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-jaxb): ≥ 0:4.0.6-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-jcip-annotations): ≥ 0:1.0.0-3.redhat_00009.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-slf4j-jboss-logmanager): ≥ 0:2.0.2-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-undertow): ≥ 0:2.3.23-1.SP3_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-bouncycastle): ≥ 0:1.83.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-guava-libraries): ≥ 0:33.0.0-2.jre_redhat_00003.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-jaxb): ≥ 0:4.0.6-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-jcip-annotations): ≥ 0:1.0.0-3.redhat_00009.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-slf4j-jboss-logmanager): ≥ 0:2.0.2-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-undertow): ≥ 0:2.3.23-1.SP3_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1.3 (io.undertow/undertow-core): ≥ 2.3.20.SP4-redhat-00001; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-apache-cxf): ≥ 0:4.0.10-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-bouncycastle): ≥ 0:1.82.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-eap-product-conf-parent): ≥ 0:801.3.0-1.GA_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-eventstream): ≥ 0:1.0.1-3.redhat_00003.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-hibernate): ≥ 0:6.6.36-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-jboss-el-api_5.0_spec): ≥ 0:4.0.2-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-jboss-threads): ≥ 0:2.5.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-undertow): ≥ 0:2.3.20-2.SP4_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly): ≥ 0:8.1.3-4.GA_redhat_00006.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-clustering): ≥ 0:5.0.12-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-elytron): ≥ 0:2.6.6-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-javadocs): ≥ 0:8.1.1-4.GA_redhat_00007.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-apache-cxf): ≥ 0:4.0.10-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-bouncycastle): ≥ 0:1.82.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-eap-product-conf-parent): ≥ 0:801.3.0-1.GA_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-eventstream): ≥ 0:1.0.1-3.redhat_00003.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-hibernate): ≥ 0:6.6.36-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-jboss-el-api_5.0_spec): ≥ 0:4.0.2-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-jboss-threads): ≥ 0:2.5.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-undertow): ≥ 0:2.3.20-2.SP4_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly): ≥ 0:8.1.3-4.GA_redhat_00006.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-clustering): ≥ 0:5.0.12-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-elytron): ≥ 0:2.6.6-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-javadocs): ≥ 0:8.1.1-4.GA_redhat_00007.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7.6.13 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7.6 for RHEL 7 (rh-sso7-keycloak): ≥ 0:18.0.20-1.redhat_00001.1.el7sso; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7.6 for RHEL 8 (rh-sso7-keycloak): ≥ 0:18.0.20-1.redhat_00001.1.el8sso; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7.6 for RHEL 9 (rh-sso7-keycloak): ≥ 0:18.0.20-1.redhat_00001.1.el9sso; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / RHEL-8 based Middleware Containers (rh-sso-7/sso76-openshift-rhel8): ≥ 7.6-85; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel - HawtIO 4 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Data Grid 8 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (moditect): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (pki-core:10.6/resteasy): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (pki-deps:10.6/resteasy): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (resteasy): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Fuse 7 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Process Automation 7 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11 (undertow-core): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 (eap7-undertow): ≥ 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 (eap7-undertow): ≥ 0:2.0.41-8.SP9_redhat_00001.1.el7eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4.24 (io.undertow/undertow-core): ≥ 2.2.39.Final-redhat-00001; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el7eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el7eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 (undertow-core): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-bouncycastle): ≥ 0:1.83.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-guava-libraries): ≥ 0:33.0.0-2.jre_redhat_00003.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-jaxb): ≥ 0:4.0.6-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-jcip-annotations): ≥ 0:1.0.0-3.redhat_00009.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-slf4j-jboss-logmanager): ≥ 0:2.0.2-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-undertow): ≥ 0:2.3.23-1.SP3_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-bouncycastle): ≥ 0:1.83.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-guava-libraries): ≥ 0:33.0.0-2.jre_redhat_00003.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-jaxb): ≥ 0:4.0.6-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-jcip-annotations): ≥ 0:1.0.0-3.redhat_00009.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-slf4j-jboss-logmanager): ≥ 0:2.0.2-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-undertow): ≥ 0:2.3.23-1.SP3_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1.6 (io.undertow/undertow-core): ≥ 2.3.24.SP2-redhat-00001; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-apache-cxf): ≥ 0:4.0.10-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-bouncycastle): ≥ 0:1.82.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-eap-product-conf-parent): ≥ 0:801.3.0-1.GA_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-eventstream): ≥ 0:1.0.1-3.redhat_00003.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-hibernate): ≥ 0:6.6.36-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-jboss-el-api_5.0_spec): ≥ 0:4.0.2-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-jboss-threads): ≥ 0:2.5.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-undertow): ≥ 0:2.3.20-2.SP4_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly): ≥ 0:8.1.3-4.GA_redhat_00006.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-clustering): ≥ 0:5.0.12-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-elytron): ≥ 0:2.6.6-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-javadocs): ≥ 0:8.1.1-4.GA_redhat_00007.1.el8eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-apache-cxf): ≥ 0:4.0.10-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-bouncycastle): ≥ 0:1.82.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-eap-product-conf-parent): ≥ 0:801.3.0-1.GA_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-eventstream): ≥ 0:1.0.1-3.redhat_00003.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-hibernate): ≥ 0:6.6.36-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-jboss-el-api_5.0_spec): ≥ 0:4.0.2-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-jboss-threads): ≥ 0:2.5.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-undertow): ≥ 0:2.3.20-2.SP4_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly): ≥ 0:8.1.3-4.GA_redhat_00006.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-clustering): ≥ 0:5.0.12-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-elytron): ≥ 0:2.6.6-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-javadocs): ≥ 0:8.1.1-4.GA_redhat_00007.1.el9eap; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat build of Apache Camel - HawtIO 4 (undertow-core): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Data Grid 8 (undertow-core): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 10 (moditect): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 8 (pki-core:10.6/resteasy): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 8 (pki-deps:10.6/resteasy): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 9 (resteasy): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Fuse 7 (undertow-core): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform 7 (undertow-core): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack (undertow-core): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Process Automation 7 (undertow-core): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Single Sign-On 7 (undertow-core): Version range not reported. Source: ADP: redhat-SADP

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:redhat:build_of_apache_camel:*:*:*:*:*:spring_boot:*:*",
            "versionEndExcluding": "4.14.4",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:data_grid:8.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "8.0.12",
            "versionStartIncluding": "8.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "8.1.3",
            "versionStartIncluding": "8.1.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:-:*:*:*:text-only:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "2.2.39",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "2.3.21",
            "versionStartIncluding": "2.3.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 9.6 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L; source: CNA: redhat

- CVSS 3.1: 9.6 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L; source: ADP: redhat-SADP

- CVSS 3.1: 9.6 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H; source: NVD: nvd@nist.gov

- CVSS 3.1: 9.6 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L; source: NVD: secalert@redhat.com

- CVSS 3.1: 9.6 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L; source: NVD: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

- CISA KEV: No listing in collected sources

- EPSS: 1.33% as of 2026-11-03; percentile 71.16%

- SSVC: exploitation poc; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-20

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2026:0383 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0384 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0386 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:33371 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:33372 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3889 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3890 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3891 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3892 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4915 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4916 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4917 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4924 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76128 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76129 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76130 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76132 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76134 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-12543 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2408784 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-12543 (ADP: redhat-SADP; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2408784 (ADP: redhat-SADP; issue-tracking, x_refsource_REDHAT)

- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-12543.json (ADP: redhat-SADP; x_sadp-csaf-vex)

- https://access.redhat.com/errata/RHSA-2026:33372 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:33371 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4915 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4916 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3889 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0383 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4917 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3891 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0384 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4924 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3892 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0386 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3890 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0383 (secalert@redhat.com; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:0384 (secalert@redhat.com; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:0386 (secalert@redhat.com; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:33371 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:33372 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:3889 (secalert@redhat.com; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:3890 (secalert@redhat.com; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:3891 (secalert@redhat.com; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:3892 (secalert@redhat.com; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:4915 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:4916 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:4917 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:4924 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76128 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76129 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76130 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76132 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76134 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-12543 (secalert@redhat.com; Vendor Advisory)

- https://bugzilla.redhat.com/show_bug.cgi?id=2408784 (secalert@redhat.com; Issue Tracking, Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:0383 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:0384 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:0386 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:33371 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:33372 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:3889 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:3890 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:3891 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:3892 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:4915 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:4916 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:4917 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:4924 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/security/cve/CVE-2025-12543 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://bugzilla.redhat.com/show_bug.cgi?id=2408784 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Issue Tracking, Vendor Advisory)

- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-12543.json (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-12543; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12543; retrieved 2026-11-04; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-12543; retrieved 2026-11-03; source updated Not reported

Revision: 592e08ffbb986e4c1408bc3f16bbd4b1133e4ad298cb20841ffcafe3a1166c7c

Canonical: https://y2.dev/cve/CVE-2025-12543

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

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