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CVE Record

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

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.

HighCVSS 8.7Not KEV-listedUpdated
Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CWE-444: Exact CWE lookup

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CVE-2026-28369 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.7 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
1ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.7CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N2.25.8redhat

Vulnerability scoring details

Base CVSS 3.1 score

8.7High
CVSS 3.1 vector shape for CVE-2026-28369Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineredhat

    Made public.

  2. Source timelineredhat

    Reported to Red Hat.

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat JBoss Enterprise Application Platform 8.1.6io.undertow/undertow-core, 2.3.24.SP2-redhat-00001affected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-activemq-artemis, 0:2.40.0-7.redhat_00015.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-eap-product-conf-parent, 0:801.6.1-1.GA_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-undertow, 0:2.3.24-3.SP2_redhat_00001.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-wildfly, 0:8.1.6-7.GA_redhat_00010.1.el8eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 9eap8-activemq-artemis, 0:2.40.0-7.redhat_00015.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 9eap8-eap-product-conf-parent, 0:801.6.1-1.GA_redhat_00001.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 9eap8-undertow, 0:2.3.24-3.SP2_redhat_00001.1.el9eapaffected
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 9eap8-wildfly, 0:8.1.6-7.GA_redhat_00010.1.el9eapaffected
Red HatRed Hat build of Apache Camel for Spring Boot 4undertow-coreaffected
Red HatRed Hat build of Apache Camel - HawtIO 4undertow-coreunaffected
Red HatRed Hat Data Grid 8undertow-coreaffected
Red HatRed Hat Enterprise Linux 10moditectunaffected
Red HatRed Hat Enterprise Linux 8pki-core:10.6/resteasyunaffected
Red HatRed Hat Enterprise Linux 8pki-deps:10.6/resteasyunaffected
Red HatRed Hat Enterprise Linux 9resteasyaffected
Red HatRed Hat Fuse 7undertow-coreaffected
Red HatRed Hat JBoss Enterprise Application Platform 7undertow-coreaffected
Red HatRed Hat JBoss Enterprise Application Platform 8org.jberet-jberet-parentaffected
Red HatRed Hat JBoss Enterprise Application Platform 8undertow-coreaffected
Red HatRed Hat JBoss Enterprise Application Platform Expansion Packorg.jberet-jberet-parentaffected
Red HatRed Hat JBoss Enterprise Application Platform Expansion Packorg.jboss.eap-jboss-eap-xpaffected
Red HatRed Hat JBoss Enterprise Application Platform Expansion Packundertow-coreunaffected
Red HatRed Hat Process Automation 7undertow-coreaffected
Red HatRed Hat Single Sign-On 7undertow-coreaffected
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-444 · source CWE mapping

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.