What is CVE-2026-12665?

CVE-2026-12665 is a high-severity vulnerability in IBM Mq Advanced Container Images, classified under Stack-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-10-19.

How severe is CVE-2026-12665?

High severity. CVSS v3 base score is 8.1 out of 10.

Buffer overflow in IBM Mq Advanced Container Images

CVE-2026-12665

IBM MQ could allow a remote attacker to execute arbitrary code due to a stack buffer overflow when processing TLS certificates with malformed distinguished names during channel connection establishment.

Vulnerability class: Buffer Overflow

Published 2026-10-19 · last modified 2026-10-19.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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)

CWE-121 — Stack-based Buffer Overflow

References

www.ibm.com/support/pages/node/7292667 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-12665?: CVE-2026-12665 is a high-severity vulnerability in IBM Mq Advanced Container Images, classified under Stack-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-10-19.
How severe is CVE-2026-12665?: High severity. CVSS v3 base score is 8.1 out of 10.