Denial of Service Risk in IBM MQ Due to Message Header Validation Flaws
CVE-2026-12343

6.5MEDIUM

Key Information:

Vendor

IBM
Status
MQ Operator
MQ Advanced Container Images
Vendor
CVE Published:
19 October 2026

What is CVE-2026-12343?

An authenticated attacker may exploit a flaw in IBM MQ by manipulating RFH2 message header fields, which could lead to a denial of service during queued publish/subscribe operations. Proper validation failures allow for potential disruption of normal service, making it essential for users to apply the recommended patches promptly.

Affected Version(s)

MQ Advanced container images 9.4.0.6-r1

MQ Advanced container images 9.4.0.6-r2

MQ Advanced container images 9.4.0.7-r1

References

https://www.ibm.com/support/pages/node/7292667
vendor-advisorypatch

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.