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9.6 Critical

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

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.

CVSS 3.1 detail

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

Exploitable remotely over the network, without an account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
None
Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

Affected products and versions

Product Affected versions Fixed in
Red Hat build of Apache Camel for Spring Boot 4 Versions not published
Red Hat build of Apache Camel - HawtIO 4 Versions not published
Red Hat Data Grid 8 Versions not published
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Fuse 7 Versions not published
Red Hat JBoss Enterprise Application Platform 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8 Versions not published
Show the 35 other branches
Product Affected versions Fixed in
Red Hat JBoss Enterprise Application Platform Expansion Pack Versions not published
Red Hat Process Automation 7 Versions not published
Red Hat Single Sign-On 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Versions not published
Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11 Versions not published
Red Hat JBoss Enterprise Application Platform 7.4 Versions not published
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 Versions not published
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 Versions not published
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 Versions not published
Red Hat JBoss Enterprise Application Platform 8.0 Versions not published
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Versions not published
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Versions not published
Red Hat JBoss Enterprise Application Platform 2.2 earliest → < 2.2.39.Final-redhat-00001 2.2.39.Final-redhat-00001
Red Hat In-Vehicle Operating System 1 Versions not published
Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server Versions not published
Red Hat JBoss EAP 7.4 ELS for RHEL 8 Versions not published
Red Hat JBoss EAP 8.0 for RHEL 8 Versions not published
Red Hat JBoss EAP 8.1 for RHEL 8 Versions not published
Red Hat JBoss EAP 7.4 ELS for RHEL 9 Versions not published
Red Hat JBoss EAP 8.0 for RHEL 9 Versions not published
Red Hat JBoss EAP 8.1 for RHEL 9 Versions not published
Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 Versions not published
Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 Versions not published
Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 Server Versions not published
Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 Server Versions not published
Red Hat JBoss Enterprise Application Platform 7.4.24 2.2 earliest → < 2.2.39.Final-redhat-00001 2.2.39.Final-redhat-00001
Red Hat JBoss Enterprise Application Platform 8.1.6 2.3 earliest → < 2.3.24.SP2-redhat-00001 2.3.24.SP2-redhat-00001
Red Hat Single Sign-On 7.6.13 Versions not published
RHEL-8 based Middleware Containers 7.6 earliest → < 7.6-85 7.6-85
Red Hat Single Sign-On 7.6 for RHEL 8 Versions not published
Red Hat Single Sign-On 7.6 for RHEL 9 Versions not published
Red Hat Single Sign-On 7.6 for RHEL 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8.1.3 2.3 earliest → < 2.3.20.SP4-redhat-00001 2.3.20.SP4-redhat-00001

Other CVEs of Red Hat build of Apache Camel for Spring Boot 4

The 106 CVEs of Red Hat build of Apache Camel for Spring Boot 4 →
CVE-2026-91920 Undertow: undertow: chunkreader message length permits chunk-size overflow 6.5 Medium CVE-2026-114370 Undertow: undertow: pathresourcemanager safepaths check allows sibling-directory symlink traversal 3.7 Low CVE-2026-93562 Io.netty/netty-codec-http: netty: incomplete validation of malformed transfer-encoding allows http request smuggling 6.5 Medium CVE-2026-93574 Io.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsing 6.5 Medium
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