What is CVE-2026-11375?

CVE-2026-11375 is a high-severity vulnerability in IBM Mq, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-09-18.

How severe is CVE-2026-11375?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in IBM Mq

CVE-2026-11375

IBM MQ could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to a stack buffer overflow when processing XA transaction identifiers.

Vulnerability class: Buffer Overflow

Published 2026-09-18 · last modified 2026-09-23.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (49.2th percentile), scored 2026-11-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003

Affected products

IBM Mq — versions 10.0.0.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

www.ibm.com/support/pages/node/7284948 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-11375?: CVE-2026-11375 is a high-severity vulnerability in IBM Mq, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-09-18.
How severe is CVE-2026-11375?: High severity. CVSS v3 base score is 8.8 out of 10.