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

No history.

Information

Published : 2026-01-07 17:15

Updated : 2026-09-07 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_expansion_pack
  • jboss_enterprise_application_platform
  • single_sign-on
  • build_of_apache_camel
  • fuse
  • process_automation
  • data_grid
CWE
CWE-20

Improper Input Validation