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Vulnerability Details :

CVE-2026-3234

Summary
Assigner-redhat
Assigner Org ID-53f830b8-0a3f-465b-8143-3b8a9948e749
Published At-12 Mar, 2026 | 10:54
Updated At-12 Mar, 2026 | 13:15
Rejected At-
Credits

Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injection

A flaw was found in mod_proxy_cluster. This vulnerability, a Carriage Return Line Feed (CRLF) injection in the decodeenc() function, allows a remote attacker to bypass input validation. By injecting CRLF sequences into the cluster configuration, an attacker can corrupt the response body of INFO endpoint responses. Exploitation requires network access to the MCMP protocol port, but no authentication is needed.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:redhat
Assigner Org ID:53f830b8-0a3f-465b-8143-3b8a9948e749
Published At:12 Mar, 2026 | 10:54
Updated At:12 Mar, 2026 | 13:15
Rejected At:
â–¼CVE Numbering Authority (CNA)
Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injection

A flaw was found in mod_proxy_cluster. This vulnerability, a Carriage Return Line Feed (CRLF) injection in the decodeenc() function, allows a remote attacker to bypass input validation. By injecting CRLF sequences into the cluster configuration, an attacker can corrupt the response body of INFO endpoint responses. Exploitation requires network access to the MCMP protocol port, but no authentication is needed.

Affected Products
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 10
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
mod_proxy_cluster
CPEs
  • cpe:/o:redhat:enterprise_linux:10
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 9
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
mod_proxy_cluster
CPEs
  • cpe:/o:redhat:enterprise_linux:9
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat JBoss Core Services
Collection URL
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
Package Name
jbcs-httpd24-mod_proxy_cluster
CPEs
  • cpe:/a:redhat:jboss_core_services:1
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat JBoss Core Services
Collection URL
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
Package Name
mod_proxy_cluster
CPEs
  • cpe:/a:redhat:jboss_core_services:1
Default Status
affected
Problem Types
TypeCWE IDDescription
CWECWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
Type: CWE
CWE ID: CWE-93
Description: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Metrics
VersionBase scoreBase severityVector
3.14.3MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Metrics Other Info
Red Hat severity rating
value:
Low
namespace:
https://access.redhat.com/security/updates/classification/
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Restrict network access to the MCMP protocol port (typically 6666) for systems running Apache mod_proxy_cluster. Configure firewall rules to limit inbound connections to this port only from trusted internal or management networks. This action reduces the attack surface by preventing unauthorized remote access to the vulnerable service. A service reload or restart may be required for firewall changes to take full effect.

Exploits

Credits

Red Hat would like to thank Coty Sutherland (@csutherl) (IBM) for reporting this issue.
Timeline
EventDate
Reported to Red Hat.2026-02-26 00:15:55
Made public.2026-02-26 00:00:00
Event: Reported to Red Hat.
Date: 2026-02-26 00:15:55
Event: Made public.
Date: 2026-02-26 00:00:00
Replaced By

Rejected Reason

References
HyperlinkResource
https://access.redhat.com/security/cve/CVE-2026-3234
vdb-entry
x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442889
issue-tracking
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/security/cve/CVE-2026-3234
Resource:
vdb-entry
x_refsource_REDHAT
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2442889
Resource:
issue-tracking
x_refsource_REDHAT
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:secalert@redhat.com
Published At:12 Mar, 2026 | 11:15
Updated At:12 Mar, 2026 | 21:07

A flaw was found in mod_proxy_cluster. This vulnerability, a Carriage Return Line Feed (CRLF) injection in the decodeenc() function, allows a remote attacker to bypass input validation. By injecting CRLF sequences into the cluster configuration, an attacker can corrupt the response body of INFO endpoint responses. Exploitation requires network access to the MCMP protocol port, but no authentication is needed.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.14.3MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Type: Primary
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-93Primarysecalert@redhat.com
CWE ID: CWE-93
Type: Primary
Source: secalert@redhat.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://access.redhat.com/security/cve/CVE-2026-3234secalert@redhat.com
N/A
https://bugzilla.redhat.com/show_bug.cgi?id=2442889secalert@redhat.com
N/A
Hyperlink: https://access.redhat.com/security/cve/CVE-2026-3234
Source: secalert@redhat.com
Resource: N/A
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2442889
Source: secalert@redhat.com
Resource: N/A

Change History

0
Information is not available yet

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Action-Not Available
Vendor-form-dataRed Hat, Inc.
Product-form-dataRed Hat Openshift Data Foundation 4Red Hat Quay 3Red Hat Developer HubOpenShift PipelinesMulticluster Engine for KubernetesRed Hat OpenShift Service Mesh 3.3Red Hat OpenShift Service Mesh 3.0Red Hat OpenShift Service Mesh 3.2Red Hat OpenShift Service Mesh 2.6Red Hat Build of Podman DesktopRed Hat 3scale API Management Platform 2Red Hat JBoss Enterprise Application Platform 7Red Hat Build of Podman Desktop - Tech PreviewRed Hat Satellite 6Red Hat OpenShift GitOpsRed Hat Discovery 2Cluster Observability Operator 1.5.0Red Hat JBoss Enterprise Application Platform 8Network Observability OperatorRed Hat OpenShift AI (RHOAI)Red Hat Enterprise Linux 7Red Hat Trusted Profile AnalyzerRed Hat OpenShift Dev SpacesSelf-service automation portal 2Red Hat OpenShift Service Mesh 3.1Red Hat Fuse 7Migration Toolkit for ContainersRed Hat Enterprise Linux 10Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat build of Apicurio Registry 3Red Hat Advanced Cluster Management for Kubernetes 2Node HealthCheck OperatorRed Hat Enterprise Linux AI (RHEL AI) 3Red Hat build of Apache Camel for Spring Boot 4Red Hat Enterprise Linux 9Red Hat Data Grid 8Red Hat Trusted Artifact SignerOpenShift Service Mesh 3Red Hat Ansible Automation Platform 2Red Hat Enterprise Linux 8Red Hat build of Apache Camel - HawtIO 4Cryostat 4Red Hat Advanced Cluster Security 4Red Hat OpenShift Virtualization 4Migration Toolkit for Applications 8Red Hat AMQ Broker 7Red Hat Hardened ImagesRed Hat OpenShift Container Platform 4
CWE ID-CWE-93
Improper Neutralization of CRLF Sequences ('CRLF Injection')
CVE-2025-8419
Matching Score-6
Assigner-Red Hat, Inc.
ShareView Details
Matching Score-6
Assigner-Red Hat, Inc.
CVSS Score-5.3||MEDIUM
EPSS-0.38% / 30.31%
||
7 Day CHG~0.00%
Published-06 Aug, 2025 | 17:10
Updated-08 Jan, 2026 | 04:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Org.keycloak/keycloak-services: keycloak smtp inject vulnerability

A vulnerability was found in Keycloak-services. Special characters used during e-mail registration may perform SMTP Injection and unexpectedly send short unwanted e-mails. The email is limited to 64 characters (limited local part of the email), so the attack is limited to very shorts emails (subject and little data, the example is 60 chars). This flaw's only direct consequence is an unsolicited email being sent from the Keycloak server. However, this action could be a precursor for more sophisticated attacks.

Action-Not Available
Vendor-KeycloakRed Hat, Inc.
Product-keycloakRed Hat build of Keycloak 26.2keycloakRed Hat build of Keycloak 26.0
CWE ID-CWE-93
Improper Neutralization of CRLF Sequences ('CRLF Injection')
Details not found