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CVE-2025-12543

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CVE-2025-12543

Published: Jan 7, 2026

Modified: May 6, 2026

PUBLISHED

CVSS v3.1

9.6

CRITICAL

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.

VendorProductVersions

Red Hat

Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11

All versions

Red Hat

Red Hat JBoss Enterprise Application Platform

unaffected
2.2.39.Final-redhat-00001 - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7

unaffected
0:2.2.39-1.Final_redhat_00001.1.el7eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7

unaffected
0:7.4.24-4.GA_redhat_00002.1.el7eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8

unaffected
0:2.2.39-1.Final_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8

unaffected
0:7.4.24-4.GA_redhat_00002.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9

unaffected
0:2.2.39-1.Final_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9

unaffected
0:7.4.24-4.GA_redhat_00002.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0

All versions

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

unaffected
0:1.83.0-1.redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

unaffected
0:33.0.0-2.jre_redhat_00003.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

unaffected
0:4.0.6-1.redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

unaffected
0:1.0.0-3.redhat_00009.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

unaffected
0:2.0.2-1.Final_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

unaffected
0:2.3.23-1.SP3_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

unaffected
0:1.83.0-1.redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

unaffected
0:33.0.0-2.jre_redhat_00003.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

unaffected
0:4.0.6-1.redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

unaffected
0:1.0.0-3.redhat_00009.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

unaffected
0:2.0.2-1.Final_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

unaffected
0:2.3.23-1.SP3_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1

All versions

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:4.0.10-1.redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:1.82.0-1.redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:801.3.0-1.GA_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:1.0.1-3.redhat_00003.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:6.6.36-1.Final_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:4.0.2-1.Final_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:2.5.0-1.redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:2.3.20-2.SP4_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:8.1.3-4.GA_redhat_00006.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:5.0.12-1.Final_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:2.6.6-1.Final_redhat_00001.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

unaffected
0:8.1.1-4.GA_redhat_00007.1.el8eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:4.0.10-1.redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:1.82.0-1.redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:801.3.0-1.GA_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:1.0.1-3.redhat_00003.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:6.6.36-1.Final_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:4.0.2-1.Final_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:2.5.0-1.redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:2.3.20-2.SP4_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:8.1.3-4.GA_redhat_00006.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:5.0.12-1.Final_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:2.6.6-1.Final_redhat_00001.1.el9eap - < *

Red Hat

Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

unaffected
0:8.1.1-4.GA_redhat_00007.1.el9eap - < *

Red Hat

Red Hat build of Apache Camel - HawtIO 4

All versions

Red Hat

Red Hat Data Grid 8

All versions

Red Hat

Red Hat Enterprise Linux 10

All versions

Red Hat

Red Hat Enterprise Linux 8

All versions

Red Hat

Red Hat Enterprise Linux 8

All versions

Red Hat

Red Hat Enterprise Linux 9

All versions

Red Hat

Red Hat Fuse 7

All versions

Red Hat

Red Hat JBoss Enterprise Application Platform 7

All versions

Red Hat

Red Hat JBoss Enterprise Application Platform Expansion Pack

All versions

Red Hat

Red Hat Process Automation 7

All versions

Red Hat

Red Hat Single Sign-On 7

All versions

Weaknesses (CWE)

CWE-20

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

Low

References

RHSA-2026:0383
vendor-advisory
x_refsource_REDHAT
RHSA-2026:0384
vendor-advisory
x_refsource_REDHAT
RHSA-2026:0386
vendor-advisory
x_refsource_REDHAT
RHSA-2026:3889
vendor-advisory
x_refsource_REDHAT
RHSA-2026:3890
vendor-advisory
x_refsource_REDHAT
RHSA-2026:3891
vendor-advisory
x_refsource_REDHAT
RHSA-2026:3892
vendor-advisory
x_refsource_REDHAT
RHSA-2026:4915
vendor-advisory
x_refsource_REDHAT
RHSA-2026:4916
vendor-advisory
x_refsource_REDHAT
RHSA-2026:4917
vendor-advisory
x_refsource_REDHAT
RHSA-2026:4924
vendor-advisory
x_refsource_REDHAT
RHBZ#2408784
issue-tracking
x_refsource_REDHAT

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