IBM MQ could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to a heap buffer overflow when processing MQPUT or MQPUT1 operations with malformed message handle properties.
**Risk verdict:** High risk: expedite remediation for exposed deployments, although the supplied data does not establish active exploitation or support a definitive exploitation-based priority.
**Why this matters:** A compromised broker could disrupt message flows or expose and alter data handled by dependent applications. Because messaging services often support business-critical integration, an outage or unauthorised code execution could affect multiple downstream processes; the extent depends on the broker’s data access and runtime permissions.
**Most likely attack path:** An attacker needs network reachability and a low-privilege account able to submit messages; no victim action is required. Scope is unchanged, but code running with the broker’s permissions may still provide a foothold in its host or container environment. KEV, SSVC, PoC and EPSS indicators were not supplied, leaving exploitation activity and likelihood uncertain.
**Who is most exposed:** Organisations running MQ brokers in container platforms or enterprise integration environments, especially where clients or partner networks can reach broker interfaces and accounts have broad message permissions.
Alert on unusual MQPUT/MQPUT1 volume or malformed message-property patterns.
Correlate broker crashes, restarts or memory faults with client sessions and queue activity.
Review unexpected child processes, outbound connections and container changes.
Mitigation and prioritisation
Identify affected deployments and upgrade operator and broker images to IBM’s fixed supported releases.
Restrict broker network access and remove or narrow unnecessary message-write permissions.
Run brokers with least privilege; validate service-account and container permissions.
Test failover and message recovery, then monitor closely after the controlled rollout.
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