IBM MQ RFH2 Header Validation DoS in Queued Pub/Sub
CVE-2026-12343 Published on October 19, 2026

IBM MQ Denial of Service
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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-12343 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

What is a Resource Exhaustion Vulnerability?

The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

CVE-2026-12343 has been classified to as a Resource Exhaustion vulnerability or weakness.


Products Associated with CVE-2026-12343

stack.watch emails you whenever new vulnerabilities are published in IBM Mq Operator or IBM Mq Advanced Container Images. Just hit a watch button to start following.

IBM Mq Operator
 
IBM Mq Advanced Container Images
 

Affected Versions

IBM MQ Operator: IBM MQ Advanced container images: