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Critical 9.6Published Jan 7, 2026
CVE-2025-12543Undertow-core: undertow http server fails to reject malformed host headers leading to potential cache poisoning and ssrf
Updated under an hour ago ()
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It affects Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11 and 18 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 9.6 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11 redhat:apache_camel_spring_boot | 4.14 | CNA record |
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 redhat:jboss_enterprise_application_platform_eus | from 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7 not affected | CNA record |
Red Hat Red Hat JBoss Enterprise Application Platform 7.4.24 redhat:jboss_enterprise_application_platform | from 2.2.39.Final-redhat-00001 not affected | CNA record |
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 redhat:jboss_enterprise_application_platform_els | from 0:2.2.39-1.Final_redhat_00001.1.el7eap not affected | CNA record |
Red Hat Red Hat Single Sign-On 7.6.13 redhat:red_hat_single_sign_on | 7.6 | CNA record |
Red Hat RHEL-8 based Middleware Containers redhat:rhosemc | from 7.6-85 not affected | CNA record |
Red Hat Red Hat build of Apache Camel - HawtIO 4 redhat:apache_camel_hawtio | 4 | CNA record |
Red Hat Red Hat Data Grid 8 redhat:jboss_data_grid | 8 | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | 10 | CNA record |
Red Hat Red Hat Fuse 7 redhat:jboss_fuse | 7 | CNA record |
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack redhat:jbosseapxp | All versions | CNA record |
Red Hat Red Hat Process Automation 7 redhat:jboss_enterprise_bpms_platform | 7 | CNA record |
Red Hat Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11 redhat:apache_camel_spring_boot | 4.14 | CISA ADP |
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 redhat:jboss_enterprise_application_platform_eus | from 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7 not affected | CISA ADP |
Red Hat Red Hat JBoss Enterprise Application Platform 7.4.24 redhat:jboss_enterprise_application_platform | from 2.2.39.Final-redhat-00001 not affected | CISA ADP |
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 redhat:jboss_enterprise_application_platform_els | from 0:2.2.39-1.Final_redhat_00001.1.el7eap not affected | CISA ADP |
Red Hat Red Hat build of Apache Camel - HawtIO 4 redhat:apache_camel_hawtio | 4 | CISA ADP |
Red Hat Red Hat Data Grid 8 redhat:jboss_data_grid | 8 | CISA ADP |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | 10 | CISA ADP |
Red Hat Red Hat Fuse 7 redhat:jboss_fuse | 7 | CISA ADP |
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack redhat:jbosseapxp | All versions | CISA ADP |
Red Hat Red Hat Process Automation 7 redhat:jboss_enterprise_bpms_platform | 7 | CISA ADP |
Red Hat Red Hat Single Sign-On 7 redhat:red_hat_single_sign_on | 7 | CISA ADP |
redhat build_of_apache_camel redhat:build_of_apache_camel | before 4.14.4 | NVD |
redhat data_grid redhat:data_grid | 8.0 | NVD |
redhat fuse redhat:fuse | 7.0.0 | NVD |
redhat jboss_enterprise_application_platform redhat:jboss_enterprise_application_platform | from 8.0 before 8.0.12; from 8.1.0 before 8.1.3; all versions; 7.0.0 | NVD |
redhat jboss_enterprise_application_platform_expansion_pack redhat:jboss_enterprise_application_platform_expansion_pack | all versions | NVD |
redhat process_automation redhat:process_automation | 7.0 | NVD |
redhat single_sign-on redhat:single_sign-on | 7.0 | NVD |
redhat undertow redhat:undertow | before 2.2.39; from 2.3.0 before 2.3.21 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:0383vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:0384vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:0386vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:33371vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:33372vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:3889vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:3890vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:3891vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:3892vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:4915vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:4916vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:4917vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:4924vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76128vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76129vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76130vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76132vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:76134vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2025-12543vdb-entry, x-refsource-redhat, vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2408784issue-tracking, x-refsource-redhat, vendor-advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-12543.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.