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

CVSS 8.7 · High EPSS 0.05% · P15
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat build of Apache Camel for Spring Boot 4-cpe:/a:redhat:camel_spring_boot:4
Red HatRed Hat build of Apache Camel - HawtIO 4-cpe:/a:redhat:apache_camel_hawtio:4
Red HatRed Hat Data Grid 8-cpe:/a:redhat:jboss_data_grid:8
Red HatRed Hat Enterprise Linux 10-cpe:/o:redhat:enterprise_linux:10
Red HatRed Hat Enterprise Linux 8-cpe:/o:redhat:enterprise_linux:8
Red HatRed Hat Enterprise Linux 8-cpe:/o:redhat:enterprise_linux:8
Red HatRed Hat Enterprise Linux 9-cpe:/o:redhat:enterprise_linux:9
Red HatRed Hat Fuse 7-cpe:/a:redhat:jboss_fuse:7
Red HatRed Hat JBoss Enterprise Application Platform 7-cpe:/a:redhat:jboss_enterprise_application_platform:7
Red HatRed Hat JBoss Enterprise Application Platform 8-cpe:/a:redhat:jboss_enterprise_application_platform:8
Red HatRed Hat JBoss Enterprise Application Platform 8-cpe:/a:redhat:jboss_enterprise_application_platform:8
Red HatRed Hat JBoss Enterprise Application Platform 8-cpe:/a:redhat:jboss_enterprise_application_platform:8
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp
Red HatRed Hat Process Automation 7-cpe:/a:redhat:jboss_enterprise_bpms_platform:7
Red HatRed 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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Same Patch Batch · Red Hat · 2026-03-27 · 4 CVEs total

CVE-2026-283688.7 HIGHUndertow: undertow: request smuggling via inconsistent header parsing
CVE-2026-283698.7 HIGHUndertow: undertow: request smuggling via malformed http request headers
CVE-2026-49485.5 MEDIUMFirewalld: firewalld: local unprivileged user can modify firewall state due to d-bus sette

IV. Related Vulnerabilities

Same product: Red Hat build of Apache Camel for Spring Boot 4
Same vendor: Red Hat
Same weakness: CWE-444

V. Comments for CVE-2026-28367

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