CVE-2026-28367

Name: CVE-2026-28367
Creator: NVD / NIST
Published: 2026-03-27T17:16:27.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.71%

Last modified Jun 17, 2026

CVE-2026-28367 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. EPSS estimates a 0.71% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.71%

48.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions
Redhat	Build Of Apache Camel - Hawtio	4.0
Redhat	Build Of Apache Camel For Spring Boot	4.0
Redhat	Data Grid	8.0
Redhat	Fuse	7.0.0
Redhat	Jboss Enterprise Application Platform	7.0.0
Redhat	Jboss Enterprise Application Platform	8.0.0
Redhat	Jboss Enterprise Application Platform Expansion Pack	All versions
Redhat	Process Automation	7.0
Redhat	Single Sign-On	7.0
Redhat	Undertow	All versions

References

https://access.redhat.com/errata/RHSA-2026:25125
https://access.redhat.com/errata/RHSA-2026:25126
https://access.redhat.com/security/cve/CVE-2026-28367Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2443260Issue Tracking, Vendor Advisory

Timeline

Published: Mar 27, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-28367?

How severe is CVE-2026-28367?

CVE-2026-28367 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2026-28367?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-28367?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST