# CVE-2026-10859: IBM MQ XMS .NET client is affected by an arbitrary code execution vulnerability

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

IBM MQ 9.2.0.0 through 9.2.0.44 LTS, 9.3.0.0 through 9.3.0.42 LTS, 9.4.0.0 through 9.4.0.26 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 through 10.0.0.5 LTS and CD could allow an authenticated attacker to execute arbitrary code on consumer applications due to insecure deserialization of ObjectMessage payloads.

## Remediation

- fix: This issue was addressed under Known Issue DT472703.



IBM MQ version 9.2 LTS



 Apply cumulative security update 9.2.0.46 https://www.ibm.com/support/pages/downloading-ibm-mq-92-lts 



IBM MQ version 9.3 LTS



 Apply cumulative security update 9.3.0.43 https://www.ibm.com/support/pages/downloading-ibm-mq-93-lts 



IBM MQ version 9.4 LTS



 Apply fix pack 9.4.0.30 https://www.ibm.com/support/pages/downloading-ibm-mq-94 



IBM MQ version 10.0.LTS



 Upgrade to IBM MQ version 10.0.0.6 https://www.ibm.com/support/pages/downloading-ibm-mq-100 



IBM MQ version 9.4 CD and 10.0 CD



 Upgrade to IBM MQ version 10.0.1.0 https://www.ibm.com/support/pages/downloading-ibm-mq-100 (source: CNA: ibm)
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: ibm) — https://www.ibm.com/support/pages/node/7294664

## Affected products and versions

- IBM / MQ: ≥ 9.2.0.0; ≤ 9.2.0.44 (affected, semver); ≥ 9.3.0.0; ≤ 9.3.0.42 (affected, semver); ≥ 9.4.0.0; ≤ 9.4.0.26 (affected, semver); ≥ 9.4.0.0; ≤ 9.4.5.1 (affected, semver); ≥ 10.0.0.0; ≤ 10.0.0.5 (affected, semver). Source: CNA: ibm

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: ibm

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.ibm.com/support/pages/node/7294664 (CNA: ibm; vendor-advisory, patch)

## Provenance

- CNA: ibm: https://www.cve.org/CVERecord?id=CVE-2026-10859; retrieved 2026-11-04; source updated 2026-11-04

Revision: aff980e58900d26268272eef5b91c2236ac7885fda182f67e08153058a506cc0

Canonical: https://y2.dev/cve/CVE-2026-10859

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