IBM MQ Authenticated DoS via NULL Pointer Deref in Multicast Messages
CVE-2026-12155 Published on October 19, 2026

IBM MQ Deserialization of Untrusted Data
IBM MQ could allow an authenticated attacker to cause a denial of service by sending specially crafted multicast status messages that trigger a NULL pointer dereference.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-12155 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 Marshaling, Unmarshaling Vulnerability?

The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

CVE-2026-12155 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.


Products Associated with CVE-2026-12155

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IBM Mq Operator
 
IBM Mq Advanced Container Images
 

Affected Versions

IBM MQ Operator: IBM MQ Advanced container images: