IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
IBM MQ affected
Version Status Constraints
9.1.0.0 affected ≤ 9.1.0.37 LTS
9.2.0.0 affected ≤ 9.2.0.43 LTS
9.3.0.0 affected ≤ 9.3.0.41 LTS
9.3.0.0 affected ≤ 9.3.5.1 CD
9.4.0.0 affected ≤ 9.4.0.25 LTS
9.4.0.0 affected ≤ 9.4.5.1 CD
10.0.0.0 affected —

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Ibm Subscribe
Mq Subscribe
Advisories

No advisories yet.

Fixes

Solution

This issue was addressed under Known Issue DT474364 IBM MQ version 9.1 LTS Apply cumulative security update 9.1.0.38 https://www.ibm.com/support/pages/downloading-ibm-mq-91-lts IBM MQ version 9.2 LTS Apply cumulative security update 9.2.0.44 https://www.ibm.com/support/pages/downloading-ibm-mq-92-lts IBM MQ version 9.3 LTS Apply cumulative security update 9.3.0.42 https://www.ibm.com/support/pages/downloading-ibm-mq-93-lts IBM MQ version 9.4 LTS Apply cumulative security update https://www.ibm.com/support/pages/downloading-ibm-mq-94-lts  9.4.0.26 https://www.ibm.com/support/pages/downloading-ibm-mq-94-lts IBM MQ version 9.3 CD, 9.4 CD and 10.0.0.0 Upgrade to IBM MQ version 10.0.0.5 https://www.ibm.com/support/pages/downloading-ibm-mq-100

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.ibm.com/support/pages/node/7284939 cve-icon cve-icon
History

Tue, 15 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing.
Title IBM MQ Java messaging is vulnerable to XML external entity injection
First Time appeared Ibm
Ibm mq
Weaknesses CWE-611
CPEs cpe:2.3:a:ibm:mq:10.0.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.1.0.37:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.2.0.43:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.3.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.3.0.41:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.4.0.25:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:9.4.5.1:*:*:*:*:*:*:*
Vendors & Products Ibm
Ibm mq
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: ibm

Published:

Updated: 2026-09-15T17:08:05.180Z

Reserved: 2026-06-18T19:13:47.535Z

Link: CVE-2026-12666

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-15T18:17:14.290

Modified: 2026-09-15T18:17:14.290

Link: CVE-2026-12666

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses