Buffer overflow in IBM Mq Advanced Container Images
CVE-2026-11831
IBM MQ could allow an authenticated attacker to cause a limited denial of service and obtain very limited information about process memory layout due to an out-of-bounds read when processing a specially crafted client request.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (8.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
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-2026-11831?
- CVE-2026-11831 is a medium-severity vulnerability in IBM Mq Advanced Container Images, classified under Heap-based Buffer Overflow. CVSS score: 5.4/10. Published 2026-10-19.
- How severe is CVE-2026-11831?
- Medium severity. CVSS v3 base score is 5.4 out of 10.