CVE-2026-28367Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator
Updated under an hour ago ()
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It affects Red Hat JBoss Enterprise Application Platform 8.1.6 and 16 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 Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web requests.
- CVSS
- 8.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-444
- 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 JBoss Enterprise Application Platform 8.1.6 redhat:jboss_enterprise_application_platform | from 2.3.24.SP2-redhat-00001 not affected | CNA record |
Red Hat Red Hat build of Apache Camel for Spring Boot 4 redhat:camel_spring_boot | 4 | 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 Single Sign-On 7 redhat:red_hat_single_sign_on | 7 | CNA record |
redhat build_of_apache_camel_-_hawtio redhat:build_of_apache_camel_-_hawtio | 4.0 | NVD |
redhat build_of_apache_camel_for_spring_boot redhat:build_of_apache_camel_for_spring_boot | 4.0 | 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 | 7.0.0; 8.0.0 | 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 | all versions | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:25125vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:25126vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-28367vdb-entry, x-refsource-redhat, vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2443260issue-tracking, x-refsource-redhat, vendor-advisory
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.