CVE-2026-12550 is a vulnerability in IBM Mq
Published on November 4, 2026
IBM MQ is affected by a denial of service vulnerability
IBM MQ 9.2.0.0 through 9.2.0.44 LTS, 9.3.0.0 through 9.3.0.42 LTS, 9.4.0.0 through 9.4.0.26 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 through 10.0.0.5 LTS and CD could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to improper validation of message selection parameters.
Vulnerability Analysis
CVE-2026-12550 is exploitable 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 a small impact on confidentiality, a small impact on integrity, and a small impact on availability.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-12550
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Affected Versions
IBM MQ:- Version 9.2.0.0, <= 9.2.0.44 is affected.
- Version 9.3.0.0, <= 9.3.0.42 is affected.
- Version 9.4.0.0, <= 9.4.0.26 is affected.
- Version 9.4.0.0, <= 9.4.5.1 is affected.
- Version 10.0.0.0, <= 10.0.0.5 is affected.