---
id: CVE-2026-10858
title: >-
  IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40 could allow an authenticated
  attacker to cause a denial of service or potentially execute arbitrary code
  due to a heap buffer underflow when processing multi-segment messages.
summary: >-
  IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40 could allow an authenticated
  attacker to cause a denial of service or potentially execute arbitrary code
  due to a heap buffer underflow when processing multi-segment messages.
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: IBM
product: MQ for HPE NonStop
affected:
  - mq_for_hpe_nonstop >= 8.1.0 <= 8.1.0.40
published: '2026-09-18'
updated: '2026-09-19'
sourceUpdated: '2026-09-19T04:17:51.203'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-10858'
references:
  - url: 'https://www.ibm.com/support/pages/node/7287704'
    label: psirt@us.ibm.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-18T17:28:46.938518Z'
ingestedAt: '2026-09-18T16:45:41.381Z'
epss: 0.00373
epssPercentile: 0.28697
---

## Overview

IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40 could allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code due to a heap buffer underflow when processing multi-segment messages.

## Remediation

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