CVE-2025-12543

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.
References
Link Resource
https://access.redhat.com/errata/RHSA-2026:0383 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:0384 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:0386 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:33371
https://access.redhat.com/errata/RHSA-2026:33372
https://access.redhat.com/errata/RHSA-2026:3889 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:3890 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:3891 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:3892 Vendor Advisory
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/security/cve/CVE-2025-12543 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2408784 Issue Tracking Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:0383 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:0384 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:0386 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:33371
https://access.redhat.com/errata/RHSA-2026:33372
https://access.redhat.com/errata/RHSA-2026:3889 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:3890 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:3891 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:3892 Vendor Advisory
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/security/cve/CVE-2025-12543 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2408784 Issue Tracking Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-12543.json
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:redhat:build_of_apache_camel:*:*:*:*:*:spring_boot:*:*
cpe:2.3:a:redhat:data_grid:8.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform:-:*:*:*:text-only:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*

History

30 Jun 2026, 05:17

Type Values Removed Values Added
References () https://access.redhat.com/errata/RHSA-2026:33371 - () https://access.redhat.com/errata/RHSA-2026:33371 -
References () https://access.redhat.com/errata/RHSA-2026:33372 - () https://access.redhat.com/errata/RHSA-2026:33372 -

30 Jun 2026, 03:16

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:33371 -
  • () https://access.redhat.com/errata/RHSA-2026:33372 -
  • () https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-12543.json -
References () https://access.redhat.com/errata/RHSA-2026:0383 - Vendor Advisory () https://access.redhat.com/errata/RHSA-2026:0383 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:0384 - Vendor Advisory () https://access.redhat.com/errata/RHSA-2026:0384 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:0386 - Vendor Advisory () https://access.redhat.com/errata/RHSA-2026:0386 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:3889 - Vendor Advisory () https://access.redhat.com/errata/RHSA-2026:3889 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:3890 - Vendor Advisory () https://access.redhat.com/errata/RHSA-2026:3890 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:3891 - Vendor Advisory () https://access.redhat.com/errata/RHSA-2026:3891 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:3892 - Vendor Advisory () https://access.redhat.com/errata/RHSA-2026:3892 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:4915 - () https://access.redhat.com/errata/RHSA-2026:4915 -
References () https://access.redhat.com/errata/RHSA-2026:4916 - () https://access.redhat.com/errata/RHSA-2026:4916 -
References () https://access.redhat.com/errata/RHSA-2026:4917 - () https://access.redhat.com/errata/RHSA-2026:4917 -
References () https://access.redhat.com/errata/RHSA-2026:4924 - () https://access.redhat.com/errata/RHSA-2026:4924 -
References () https://access.redhat.com/security/cve/CVE-2025-12543 - Vendor Advisory () https://access.redhat.com/security/cve/CVE-2025-12543 - Vendor Advisory
References () https://bugzilla.redhat.com/show_bug.cgi?id=2408784 - Issue Tracking, Vendor Advisory () https://bugzilla.redhat.com/show_bug.cgi?id=2408784 - Issue Tracking, Vendor Advisory

18 Mar 2026, 16:16

Type Values Removed Values Added
Summary
  • (es) Se encontró una vulnerabilidad en el núcleo del servidor HTTP Undertow, que se utiliza en WildFly, JBoss EAP y otras aplicaciones Java. La biblioteca Undertow no valida correctamente el encabezado Host en las solicitudes HTTP entrantes. Como resultado, las solicitudes que contienen encabezados Host malformados o maliciosos se procesan sin ser rechazadas, lo que permite a los atacantes envenenar cachés, realizar escaneos de red internos o secuestrar sesiones de usuario.
References
  • () 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 -

10 Mar 2026, 19:53

Type Values Removed Values Added
References () https://access.redhat.com/errata/RHSA-2026:0383 - () https://access.redhat.com/errata/RHSA-2026:0383 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:0384 - () https://access.redhat.com/errata/RHSA-2026:0384 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:0386 - () https://access.redhat.com/errata/RHSA-2026:0386 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:3889 - () https://access.redhat.com/errata/RHSA-2026:3889 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:3890 - () https://access.redhat.com/errata/RHSA-2026:3890 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:3891 - () https://access.redhat.com/errata/RHSA-2026:3891 - Vendor Advisory
References () https://access.redhat.com/errata/RHSA-2026:3892 - () https://access.redhat.com/errata/RHSA-2026:3892 - Vendor Advisory
References () https://access.redhat.com/security/cve/CVE-2025-12543 - () https://access.redhat.com/security/cve/CVE-2025-12543 - Vendor Advisory
References () https://bugzilla.redhat.com/show_bug.cgi?id=2408784 - () https://bugzilla.redhat.com/show_bug.cgi?id=2408784 - Issue Tracking, Vendor Advisory
First Time Redhat fuse
Redhat jboss Enterprise Application Platform Expansion Pack
Redhat build Of Apache Camel
Redhat data Grid
Redhat
Redhat process Automation
Redhat jboss Enterprise Application Platform
Redhat single Sign-on
Redhat undertow
CPE cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:build_of_apache_camel:*:*:*:*:*:spring_boot:*:*
cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform:-:*:*:*:text-only:*:*:*
cpe:2.3:a:redhat:data_grid:8.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*

05 Mar 2026, 20:16

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:3889 -
  • () https://access.redhat.com/errata/RHSA-2026:3891 -
  • () https://access.redhat.com/errata/RHSA-2026:3892 -

05 Mar 2026, 15:16

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:3890 -

08 Jan 2026, 23:15

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:0383 -

08 Jan 2026, 17:15

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:0384 -
  • () https://access.redhat.com/errata/RHSA-2026:0386 -

07 Jan 2026, 17:15

Type Values Removed Values Added
New CVE

Information

Published : 2026-01-07 17:15

Updated : 2026-07-28 13:17


NVD link : CVE-2025-12543

Mitre link : CVE-2025-12543

CVE.ORG link : CVE-2025-12543


JSON object : View

Products Affected

redhat

  • undertow
  • jboss_enterprise_application_platform
  • process_automation
  • data_grid
  • jboss_enterprise_application_platform_expansion_pack
  • single_sign-on
  • build_of_apache_camel
  • fuse
CWE
CWE-20

Improper Input Validation