Deserialization in IBM Mq Advanced Container Images
CVE-2026-12155
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- IBM Mq Advanced Container Images — versions 10.0.0.5-r1, 9.3.0.0-r1, 9.3.0.0-r2
- IBM Mq Operator — versions 3.4.1, 3.5.0, 3.8.0
Weakness classification (CWE)
References
- www.ibm.com/support/pages/node/7292667 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-12155?
- CVE-2026-12155 is a medium-severity vulnerability in IBM Mq Advanced Container Images, classified under Deserialization of Untrusted Data. CVSS score: 6.5/10. Published 2026-10-19.
- How severe is CVE-2026-12155?
- Medium severity. CVSS v3 base score is 6.5 out of 10.