CVE-2026-12343
Received Received - Intake

IBM MQ Denial of Service via RFH2 Header Validation

Publication date: 2026-10-19

Last updated on: 2026-10-19

Assigner: IBM Corporation

Description
IBM MQ could allow an authenticated attacker to cause a denial of service due to improper validation of RFH2 message header fields in queued publish/subscribe operations.

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Meta Information

Published
2026-10-19
Last Modified
2026-10-19
Generated
2026-10-19
AI Q&A
2026-10-19
EPSS Evaluated
N/A
NVD
CVE-2026-12343
EUVD
EUVD-2026-104468

Affected Vendors & Products

Showing 89 associated CPEs
Vendor Product Version / Range
IBM MQ Operator 3.2.0
IBM MQ Operator 3.3.0
IBM MQ Operator 3.4.1
IBM MQ Operator 3.5.0
IBM MQ Operator 3.5.1
IBM MQ Operator 3.6.0
IBM MQ Operator 3.7.0
IBM MQ Operator 3.8.0
IBM MQ Operator 3.8.1
IBM MQ Operator 3.9.0
IBM MQ Operator 3.9.1
IBM MQ Operator 3.9.2
IBM MQ Operator 4.0.0
IBM MQ Operator 4.0.1
IBM MQ Operator 4.0.2
IBM MQ Operator 4.0.3
IBM MQ Operator 4.0.4
IBM MQ Operator 2.0.0
IBM MQ Advanced container images 9.4.0.6-r1
IBM MQ Advanced container images 9.4.0.6-r2
IBM MQ Advanced container images 9.4.0.7-r1
IBM MQ Advanced container images 9.4.0.10-r1
IBM MQ Advanced container images 9.4.0.10-r2
IBM MQ Advanced container images 9.4.0.11-r1
IBM MQ Advanced container images 9.4.0.11-r2
IBM MQ Advanced container images 9.4.0.11-r3
IBM MQ Advanced container images 9.4.0.12-r1
IBM MQ Advanced container images 9.4.0.15-r1
IBM MQ Advanced container images 9.4.0.16-r1
IBM MQ Advanced container images 9.4.0.16-r2
IBM MQ Advanced container images 9.4.0.17-r1
IBM MQ Advanced container images 9.4.0.17-r2
IBM MQ Advanced container images 9.4.0.20-r1
IBM MQ Advanced container images 9.4.0.21-r1
IBM MQ Advanced container images 9.4.0.21-r2
IBM MQ Advanced container images 9.4.0.25-r1
IBM MQ Advanced container images 9.4.0.26-r1
IBM MQ Advanced container images 9.4.1.0-r1
IBM MQ Advanced container images 9.4.1.0-r2
IBM MQ Advanced container images 9.4.1.1-r1
IBM MQ Advanced container images 9.4.2.0-r1
IBM MQ Advanced container images 9.4.2.0-r2
IBM MQ Advanced container images 9.4.2.1-r1
IBM MQ Advanced container images 9.4.2.1-r2
IBM MQ Advanced container images 9.4.3.0-r1
IBM MQ Advanced container images 9.4.3.0-r2
IBM MQ Advanced container images 9.4.3.1-r1
IBM MQ Advanced container images 9.4.4.0-r1
IBM MQ Advanced container images 9.4.4.1-r1
IBM MQ Advanced container images 9.4.5.0-r1
IBM MQ Advanced container images 9.4.5.0-r2
IBM MQ Advanced container images 9.4.5.1-r1
IBM MQ Advanced container images 10.0.0.0-r1
IBM MQ Advanced container images 10.0.0.5-r1
IBM MQ Advanced container images 9.3.0.0-r1
IBM MQ Advanced container images 9.3.0.0-r2
IBM MQ Advanced container images 9.3.0.0-r3
IBM MQ Advanced container images 9.3.0.1-r1
IBM MQ Advanced container images 9.3.0.1-r2
IBM MQ Advanced container images 9.3.0.1-r3
IBM MQ Advanced container images 9.3.0.1-r4
IBM MQ Advanced container images 9.3.0.3-r1
IBM MQ Advanced container images 9.3.0.4-r1
IBM MQ Advanced container images 9.3.0.4-r2
IBM MQ Advanced container images 9.3.0.5-r1
IBM MQ Advanced container images 9.3.0.5-r2
IBM MQ Advanced container images 9.3.0.5-r3
IBM MQ Advanced container images 9.3.0.6-r1
IBM MQ Advanced container images 9.3.0.10-r1
IBM MQ Advanced container images 9.3.0.10-r2
IBM MQ Advanced container images 9.3.0.11-r1
IBM MQ Advanced container images 9.3.0.11-r2
IBM MQ Advanced container images 9.3.0.15-r1
IBM MQ Advanced container images 9.3.0.16-r1
IBM MQ Advanced container images 9.3.0.16-r2
IBM MQ Advanced container images 9.3.0.17-r1
IBM MQ Advanced container images 9.3.0.17-r2
IBM MQ Advanced container images 9.3.0.17-r3
IBM MQ Advanced container images 9.3.0.20-r1
IBM MQ Advanced container images 9.3.0.20-r2
IBM MQ Advanced container images 9.3.0.21-r1
IBM MQ Advanced container images 9.3.0.21-r2
IBM MQ Advanced container images 9.3.0.21-r3
IBM MQ Advanced container images 9.3.0.25-r1
IBM MQ Advanced container images 9.4.0.0-r1
IBM MQ Advanced container images 9.4.0.0-r2
IBM MQ Advanced container images 9.4.0.0-r3
IBM MQ Advanced container images 9.4.0.5-r1
IBM MQ Advanced container images 9.4.0.5-r2

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This vulnerability in IBM MQ allows an authenticated attacker to cause a denial of service by exploiting improper validation of RFH2 message header fields during queued publish/subscribe operations.

Impact Analysis

An attacker could disrupt message processing in IBM MQ, leading to service unavailability for applications relying on publish/subscribe functionality.

Mitigation Strategies

Apply the latest IBM MQ security patches or updates as soon as they become available to address the improper validation of RFH2 message header fields.

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