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.

What this means for your business

It affects Redhat Build Of Apache Camel. It matters if your company, or a supplier that handles your data, runs it.
An attacker can use it remotely, over a network, without a login, but only after tricking someone into an action such as opening a file or a link.
FIRST's prediction model gives it a 1% chance of attack attempts being seen in the next 30 days, ranking above 70% of all known flaws.

What to do

1Check whether your company or your suppliers run Redhat Build Of Apache Camel, and which version. The affected versions are listed further down this page.
2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS: 9.6 (v3.1)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
Weakness: CWE-20
Assigned by: secalert@redhat.com

Dates

Published: 2026-01-07
Last modified: 2026-09-07
Sources: NVD

Affected products

Redhat Build Of Apache Camel- 4.14.4
Redhat Data Grid8.0
Redhat Fuse7.0.0
Redhat Jboss Enterprise Application Platform8.0 - 8.0.12, 8.1.0 - 8.1.3, all versions, 7.0.0
Redhat Jboss Enterprise Application Platform Expansion Packall versions
Redhat Process Automation7.0
Redhat Single Sign-On7.0
Redhat Undertow- 2.2.39, 2.3.0 - 2.3.21

As listed in the NVD configuration data. Not a statement about your estate.