Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-28367

CVE-2026-28367CRITICAL

Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA — Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  N    9.1   .0089   57.9     —

AFFECTED
  Product                                                       Versions     Fixed
  Red Hat JBoss Enterprise Application Platform 8.1.7.GA        unspecified  2.3.24.SP3-redhat-00001
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8  unspecified  0:2.40.0-7.redhat_00015.1.el8eap
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8  unspecified  0:801.6.1-1.GA_redhat_00001.1.el8eap
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8  unspecified  0:2.3.24-3.SP2_redhat_00001.1.el8eap
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8  unspecified  0:8.1.6-7.GA_redhat_00010.1.el8eap
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9  unspecified  0:2.40.0-7.redhat_00015.1.el9eap
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9  unspecified  0:801.6.1-1.GA_redhat_00001.1.el9eap
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9  unspecified  0:2.3.24-3.SP2_redhat_00001.1.el9eap
  Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9  unspecified  0:8.1.6-7.GA_redhat_00010.1.el9eap
  Red Hat build of Apache Camel for Spring Boot 4               unspecified  —
  + 15 more

TIMELINE
  Feb 27  Reserved by redhat
  Mar 27  Published (CNA: redhat)
  Sep 21  RESCORED — CVE-2026-28367 (Red Hat JBoss Enterprise Application Platform 8.1.7.GA). CVSS 8.7 → 9.1 (NVD).

CWE-444 · CNA: redhat · CVSS v3.1 · 4 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
February 27, 2026	Reserved	Reserved by redhat
March 27, 2026	Published	Published (CNA: redhat)
September 21, 2026	RESCORED	RESCORED — CVE-2026-28367 (Red Hat JBoss Enterprise Application Platform 8.1.7.GA). CVSS 8.7 → 9.1 (NVD).

Affected

Affected products and packages — 25 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1.7.GA	—	—	2.3.24.SP3-redhat-00001
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	—	—	0:2.40.0-7.redhat_00015.1.el8eap
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	—	—	0:801.6.1-1.GA_redhat_00001.1.el8eap
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	—	—	0:2.3.24-3.SP2_redhat_00001.1.el8eap
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	—	—	0:8.1.6-7.GA_redhat_00010.1.el8eap
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	—	—	0:2.40.0-7.redhat_00015.1.el9eap
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	—	—	0:801.6.1-1.GA_redhat_00001.1.el9eap
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	—	—	0:2.3.24-3.SP2_redhat_00001.1.el9eap
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	—	—	0:8.1.6-7.GA_redhat_00010.1.el9eap
Red Hat	Red Hat build of Apache Camel for Spring Boot 4	—	—	—
Red Hat	Red Hat build of Apache Camel - HawtIO 4	—	—	—
Red Hat	Red Hat Data Grid 8	—	—	—
Red Hat	Red Hat Enterprise Linux 10	—	—	—
Red Hat	Red Hat Enterprise Linux 8	—	—	—
Red Hat	Red Hat Enterprise Linux 8	—	—	—
Red Hat	Red Hat Enterprise Linux 9	—	—	—
Red Hat	Red Hat Fuse 7	—	—	—
Red Hat	Red Hat JBoss Enterprise Application Platform 7	—	—	—
Red Hat	Red Hat JBoss Enterprise Application Platform 8	—	—	—
Red Hat	Red Hat JBoss Enterprise Application Platform 8	—	—	—
Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	—	—	—
Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	—	—	—
Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	—	—	—
Red Hat	Red Hat Process Automation 7	—	—	—
Red Hat	Red Hat Single Sign-On 7	—	—	—

Weaknesses

CWE-444

References (4)

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

Authoritative record: CVE-2026-28367 at cve.org

Vendors: red hat

Weaknesses: CWE-444

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-28367 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.