CVE-2026-12343
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IBM MQ Denial of Service via RFH2 Header Validation

Publication date: 2026-10-19

Last updated on: 2026-10-23

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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Probability:
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Meta Information

Published
2026-10-19
Last Modified
2026-10-23
Generated
2026-11-08
AI Q&A
2026-10-19
EPSS Evaluated
2026-11-07
NVD
CVE-2026-12343
EUVD
EUVD-2026-104468

Affected Vendors & Products

Showing 109 associated CPEs
Vendor Product Version / Range
ibm mq_operator From 2.0.0 (inc) to 2.0.29 (inc)
ibm mq_operator 3.3.0
ibm mq_operator 3.4.0
ibm mq_operator 3.4.1
ibm mq_operator 3.5.0
ibm mq_operator 3.5.1
ibm supplied_mq_advanced_container_images 9.4.1.0
ibm supplied_mq_advanced_container_images 9.4.1.0
ibm supplied_mq_advanced_container_images 9.4.1.1
ibm supplied_mq_advanced_container_images 9.4.2.0
ibm supplied_mq_advanced_container_images 9.4.2.0
ibm supplied_mq_advanced_container_images 9.4.2.1
ibm supplied_mq_advanced_container_images 9.4.2.1
ibm supplied_mq_advanced_container_images 9.4.3.0
ibm mq_operator From 3.2.0 (inc) to 3.2.29 (inc)
ibm mq_operator 3.5.2
ibm mq_operator 3.5.3
ibm mq_operator 3.6.0
ibm mq_operator 3.6.1
ibm mq_operator 3.6.2
ibm mq_operator 3.6.3
ibm mq_operator 3.6.4
ibm mq_operator 3.7.0
ibm mq_operator 3.7.1
ibm mq_operator 3.7.2
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 supplied_mq_advanced_container_images 10.0.0.0
ibm supplied_mq_advanced_container_images 10.0.0.0
ibm supplied_mq_advanced_container_images 10.0.0.0
ibm supplied_mq_advanced_container_images 10.0.0.0
ibm supplied_mq_advanced_container_images 10.0.0.5
ibm supplied_mq_advanced_container_images 9.4.3.0
ibm supplied_mq_advanced_container_images 9.4.3.1
ibm supplied_mq_advanced_container_images 9.4.3.1
ibm supplied_mq_advanced_container_images 9.4.3.1
ibm supplied_mq_advanced_container_images 9.4.4.0
ibm supplied_mq_advanced_container_images 9.4.4.0
ibm supplied_mq_advanced_container_images 9.4.4.0
ibm supplied_mq_advanced_container_images 9.4.4.0
ibm supplied_mq_advanced_container_images 9.4.4.1
ibm supplied_mq_advanced_container_images 9.4.5.0
ibm supplied_mq_advanced_container_images 9.4.5.0
ibm supplied_mq_advanced_container_images 9.4.5.1
ibm supplied_mq_advanced_container_images 9.3.0.0
ibm supplied_mq_advanced_container_images 9.3.0.0
ibm supplied_mq_advanced_container_images 9.3.0.0
ibm supplied_mq_advanced_container_images 9.3.0.1
ibm supplied_mq_advanced_container_images 9.3.0.1
ibm supplied_mq_advanced_container_images 9.3.0.1
ibm supplied_mq_advanced_container_images 9.3.0.1
ibm supplied_mq_advanced_container_images 9.3.0.10
ibm supplied_mq_advanced_container_images 9.3.0.10
ibm supplied_mq_advanced_container_images 9.3.0.11
ibm supplied_mq_advanced_container_images 9.3.0.11
ibm supplied_mq_advanced_container_images 9.3.0.15
ibm supplied_mq_advanced_container_images 9.3.0.16
ibm supplied_mq_advanced_container_images 9.3.0.16
ibm supplied_mq_advanced_container_images 9.3.0.17
ibm supplied_mq_advanced_container_images 9.3.0.17
ibm supplied_mq_advanced_container_images 9.3.0.17
ibm supplied_mq_advanced_container_images 9.3.0.20
ibm supplied_mq_advanced_container_images 9.3.0.20
ibm supplied_mq_advanced_container_images 9.3.0.3
ibm supplied_mq_advanced_container_images 9.3.0.4
ibm supplied_mq_advanced_container_images 9.3.0.4
ibm supplied_mq_advanced_container_images 9.3.0.5
ibm supplied_mq_advanced_container_images 9.3.0.5
ibm supplied_mq_advanced_container_images 9.3.0.5
ibm supplied_mq_advanced_container_images 9.3.0.6
ibm supplied_mq_advanced_container_images 9.3.0.21
ibm supplied_mq_advanced_container_images 9.3.0.21
ibm supplied_mq_advanced_container_images 9.3.0.21
ibm supplied_mq_advanced_container_images 9.3.0.25
ibm supplied_mq_advanced_container_images 9.4.0.0
ibm supplied_mq_advanced_container_images 9.4.0.0
ibm supplied_mq_advanced_container_images 9.4.0.0
ibm supplied_mq_advanced_container_images 9.4.0.5
ibm supplied_mq_advanced_container_images 9.4.0.5
ibm supplied_mq_advanced_container_images 9.4.0.10
ibm supplied_mq_advanced_container_images 9.4.0.10
ibm supplied_mq_advanced_container_images 9.4.0.11
ibm supplied_mq_advanced_container_images 9.4.0.11
ibm supplied_mq_advanced_container_images 9.4.0.6
ibm supplied_mq_advanced_container_images 9.4.0.6
ibm supplied_mq_advanced_container_images 9.4.0.7
ibm supplied_mq_advanced_container_images 9.4.0.11
ibm supplied_mq_advanced_container_images 9.4.0.12
ibm supplied_mq_advanced_container_images 9.4.0.12
ibm supplied_mq_advanced_container_images 9.4.0.15
ibm supplied_mq_advanced_container_images 9.4.0.15
ibm supplied_mq_advanced_container_images 9.4.0.16
ibm supplied_mq_advanced_container_images 9.4.0.16
ibm supplied_mq_advanced_container_images 9.4.0.17
ibm supplied_mq_advanced_container_images 9.4.0.17
ibm supplied_mq_advanced_container_images 9.4.0.20
ibm supplied_mq_advanced_container_images 9.4.0.21
ibm supplied_mq_advanced_container_images 9.4.0.21
ibm supplied_mq_advanced_container_images 9.4.0.25
ibm supplied_mq_advanced_container_images 9.4.0.25
ibm supplied_mq_advanced_container_images 9.4.0.26

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.

Compliance Impact

This vulnerability could impact compliance by causing service disruptions in IBM MQ systems handling sensitive data. Denial of service may lead to unauthorized access or data processing delays, potentially violating GDPR's availability principle or HIPAA's access controls.

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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