---
id: CVE-2026-11378
title: >-
  IBM MQ could allow an authenticated attacker to cause a denial of service or
  potentially execute arbitrary code due to an integer overflow in distribution
  list processing.
summary: >-
  IBM MQ could allow an authenticated attacker to cause a denial of service or
  potentially execute arbitrary code due to an integer overflow in distribution
  list processing.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: ibm
product: mq
affected:
  - 'mq >= 9.1.0.0, <= 9.1.0.37'
  - 'mq >= 9.2.0.0, <= 9.2.0.43'
  - 'mq >= 9.3.0.0, <= 9.3.0.41'
  - 'mq >= 9.3.0.0, <= 9.3.5.1'
  - 'mq >= 9.4.0.0, <= 9.4.0.25'
  - 'mq >= 9.4.0.0, <= 9.4.5.1'
  - mq = 10.0.0.0
published: '2026-09-18'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:23:54.403'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-11378'
references:
  - url: 'https://www.ibm.com/support/pages/node/7284945'
    label: psirt@us.ibm.com
tags:
  - nvd
  - cve.org
epss: 0.00336
epssPercentile: 0.24256
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-19T03:56:53.450763Z'
ingestedAt: '2026-09-18T16:45:41.382Z'
---

## Overview

IBM MQ could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to an integer overflow in distribution list processing.

## Affected

- `mq >= 9.1.0.0, <= 9.1.0.37`
- `mq >= 9.2.0.0, <= 9.2.0.43`
- `mq >= 9.3.0.0, <= 9.3.0.41`
- `mq >= 9.3.0.0, <= 9.3.5.1`
- `mq >= 9.4.0.0, <= 9.4.0.25`
- `mq >= 9.4.0.0, <= 9.4.5.1`
- `mq = 10.0.0.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.