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CVE-2026-28367— Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator

Quick assessment

Affected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.6
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Undertow是美国Undertow公司的一个Web服务器。 Undertow存在环境问题漏洞，该漏洞源于远程攻击者可发送特定标头块终止符，可能导致请求夹带攻击。

CVSS 8.7 · High EPSS 0.72% · P54

Affected Version Matrix 25

VendorProduct Version RangeStatus
Red Hat Red Hat build of Apache Camel - HawtIO 4 any unaffected
Red Hat Red Hat build of Apache Camel for Spring Boot 4 any affected
Red Hat Red Hat Data Grid 8 any affected
Red Hat Red Hat Enterprise Linux 10 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
Red Hat Red Hat Fuse 7 any affected
Red Hat Red Hat JBoss Enterprise Application Platform 7 any affected
Red Hat Red Hat JBoss Enterprise Application Platform 8 any affected
any affected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 0:2.40.0-7.redhat_00015.1.el8eap< * unaffected
0:801.6.1-1.GA_redhat_00001.1.el8eap< * unaffected
0:2.3.24-3.SP2_redhat_00001.1.el8eap< * unaffected
0:8.1.6-7.GA_redhat_00010.1.el8eap< * unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 0:2.40.0-7.redhat_00015.1.el9eap< * unaffected
0:801.6.1-1.GA_redhat_00001.1.el9eap< * unaffected
0:2.3.24-3.SP2_redhat_00001.1.el9eap< * unaffected
0:8.1.6-7.GA_redhat_00010.1.el9eap< * unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.6 2.3.24.SP2-redhat-00001< * unaffected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any affected
any affected
any unaffected
Red Hat Red Hat Process Automation 7 any affected
Red Hat Red Hat Single Sign-On 7 any affected
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I. Basic Information for CVE-2026-28367

Vulnerability Information
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Vulnerability Title
Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Undertow 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Undertow是美国Undertow公司的一个Web服务器。 Undertow存在环境问题漏洞，该漏洞源于远程攻击者可发送特定标头块终止符，可能导致请求夹带攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.6 2.3.24.SP2-redhat-00001 ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 0:2.40.0-7.redhat_00015.1.el8eap ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 0:801.6.1-1.GA_redhat_00001.1.el8eap ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 0:2.3.24-3.SP2_redhat_00001.1.el8eap ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 0:8.1.6-7.GA_redhat_00010.1.el8eap ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 0:2.40.0-7.redhat_00015.1.el9eap ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 0:801.6.1-1.GA_redhat_00001.1.el9eap ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 0:2.3.24-3.SP2_redhat_00001.1.el9eap ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 0:8.1.6-7.GA_redhat_00010.1.el9eap ~ * cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
Red Hat Red Hat build of Apache Camel for Spring Boot 4 - cpe:/a:redhat:camel_spring_boot:4
Red Hat Red Hat build of Apache Camel - HawtIO 4 - cpe:/a:redhat:apache_camel_hawtio:4
Red Hat Red Hat Data Grid 8 - cpe:/a:redhat:jboss_data_grid:8
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Fuse 7 - cpe:/a:redhat:jboss_fuse:7
Red Hat Red Hat JBoss Enterprise Application Platform 7 - cpe:/a:redhat:jboss_enterprise_application_platform:7
Red Hat Red Hat JBoss Enterprise Application Platform 8 - cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat Red Hat JBoss Enterprise Application Platform 8 - cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat Process Automation 7 - cpe:/a:redhat:jboss_enterprise_bpms_platform:7
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-28367

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III. Intelligence Information for CVE-2026-28367

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Vendor Advisories for CVE-2026-28367 (4)

Same Patch Batch · Red Hat · 2026-03-27 · 4 CVEs total

CVE-2026-28368 8.7 HIGH Undertow: undertow: request smuggling via inconsistent header parsing
CVE-2026-28369 8.7 HIGH Undertow: undertow: request smuggling via malformed http request headers
CVE-2026-4948 5.5 MEDIUM Firewalld: firewalld: local unprivileged user can modify firewall state due to d-bus sette

IV. Related Vulnerabilities

Same product: Red Hat JBoss Enterprise Application Platform 8.1.6
Same vendor: Red Hat
Same weakness: CWE-444