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Vulnerability · Published Mar 27, 2026 · Assigned by redhat

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

High 8.7

In plain English

A high-severity security flaw in Red Hat build of Apache Camel for Spring Boot 4 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.7High
Exploit odds (30 days)0.7%top 45.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:14undertowno fix listedDEBIAN-CVE-2026-28367
Mavenio.undertow:undertow-core2.3.25.FinalGHSA-3gv6-g396-9v4r
Mavenio.undertow:undertow-core2.2.40.FinalGHSA-3gv6-g396-9v4r
Ubuntu:25.10undertowno fix listedUBUNTU-CVE-2026-28367
Ubuntu:26.04:LTSundertowno fix listedUBUNTU-CVE-2026-28367
Ubuntu:26.10undertowno fix listedUBUNTU-CVE-2026-28367

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.6 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 see references
Red Hat Red Hat build of Apache Camel for Spring Boot 4 see references
Red Hat Red Hat build of Apache Camel - HawtIO 4 see references
Red Hat Red Hat Data Grid 8 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Fuse 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 7 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8 see references
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack see references
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack see references
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack see references
Red Hat Red Hat Process Automation 7 see references
Red Hat Red Hat Single Sign-On 7 see references

Weakness: CWE-444 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

References