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Vulnerability · Published Mar 27, 2026 · Assigned by redhat

CVE-2026-28369Undertow: undertow: request smuggling via malformed http request headers

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 53% 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 47.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:14undertowno fix listedDEBIAN-CVE-2026-28369
Mavenio.undertow:undertow-core2.2.40.FinalGHSA-vqqj-9cmv-hx43
Mavenio.undertow:undertow-core2.3.25.FinalGHSA-vqqj-9cmv-hx43
Ubuntu:25.10undertowno fix listedUBUNTU-CVE-2026-28369
Ubuntu:26.04:LTSundertowno fix listedUBUNTU-CVE-2026-28369
Ubuntu:26.10undertowno fix listedUBUNTU-CVE-2026-28369

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