CVE-2026-28367

criticalpriority · track · 36EPSS 0.007 · 54 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.72% (54th) EPSS

CVSS 9.1 · critical

Is it mine?

21 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.3–9.1

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 5.2

v3.18.7highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Nsecondary · ENISA EU

v3.18.7highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Nsecondary · secalert@redhat.com USexploitability 2.2 · impact 5.8

v3.18.7highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Nsecondary · OSV

v3.18.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-444USCWE-444US

affected products (21)

Products and version ranges known to be affected.

Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat Undertowall versionscert_bundDEcpe:/a:redhat:undertow:-
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8< 0:2.3.24-3.SP2_redhat_00001.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8< 0:2.40.0-7.redhat_00015.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8< 0:8.1.6-7.GA_redhat_00010.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8< 0:801.6.1-1.GA_redhat_00001.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9< 0:2.3.24-3.SP2_redhat_00001.1.el9eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9< 0:2.40.0-7.redhat_00015.1.el9eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9< 0:8.1.6-7.GA_redhat_00010.1.el9eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9< 0:801.6.1-1.GA_redhat_00001.1.el9eapenisa_euvdEU
redhat build of apache camel - hawtio= 4.0nvdUScpe:2.3:a:redhat:build_of_apache_camel_-_hawtio:*:*:*:*:*:*:*:*
redhat build of apache camel for spring boot= 4.0nvdUScpe:2.3:a:redhat:build_of_apache_camel_for_spring_boot:*:*:*:*:*:*:*:*
redhat data grid= 8.0nvdUScpe:2.3:a:redhat:data_grid:*:*:*:*:*:*:*:*
redhat fuse= 7.0.0nvdUScpe:2.3:a:redhat:fuse:*:*:*:*:*:*:*:*
redhat jboss enterprise application platform= 7.0.0nvdUScpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*
redhat jboss enterprise application platform= 8.0.0nvdUScpe:2.3:a:redhat:jboss_enterprise_application_platform:*:*:*:*:*:*:*:*
redhat jboss enterprise application platform expansion packall versionsnvdUScpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:*:*:*:*:*:*:*:*
redhat process automation= 7.0nvdUScpe:2.3:a:redhat:process_automation:*:*:*:*:*:*:*:*
redhat single sign-on= 7.0nvdUScpe:2.3:a:redhat:single_sign-on:*:*:*:*:*:*:*:*
redhat undertowall versionsnvdUScpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*

showing 20 of 21

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0907Red Hat Undertow: Mehrere Schwachstellen ermöglichen Umgehung von SicherheitsmaßnahmenDeutsch2026-03-29csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Undertow ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Daten zu manipulieren und vertrauliche Informationen offenzulegen.
GHSA-3gv6-g396-9v4rUndertow is Vulnerable to HTTP Request/Response Smuggling2026-03-27ghsa · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2026-03-27modified 2026-10-26

references (10)

External citations — patches, advisories, analysis.

scry

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