CVE-2026-28367

moderate-risk

Published 2026-03-27

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.

Do I need to act?

0.04% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 8.7/10 High

NETWORK / HIGH complexity

Affected Products (10)

Build Of Apache Camel - Hawtio

Build Of Apache Camel For Spring Boot

Data Grid

Fuse

Jboss Enterprise Application Platform

Jboss Enterprise Application Platform Expansion Pack

Process Automation

Single Sign-On

Undertow

Affected Vendors

Redhat

References (2)

Vendor Advisory https://access.redhat.com/security/cve/CVE-2026-28367

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2443260

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moderate-risk

Severity 26/34 · High

Exploitability 0/34 · Minimal

Exposure 16/34 · Moderate