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ESB-2026.4857 PUBLISHED CVSS 7.5 HIGH

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4857 IBM MQ is affected by multiple Java vulnerabilities (CVE-2026-21945, CVE-2026-21932, CVE-2026-21933, CVE-2026-21925) 8 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: IBM MQ Publisher: IBM Operating System: IBM i Windows AIX Solaris Linux Resolution: Patch/Upgrade CVE Names: CVE-2026-21945 CVE-2026-21932 CVE-2026-21933 CVE-2026-21925 Original Bulletin: https://www.ibm.com/support/pages/node/7269378 Comment: CVSS (Max): 7.5 CVE-2026-21945 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVSS Source: IBM Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H EPSS (Max): 0.1% (16th)* CVE-2026-21945 2026-05-07 * Not all EPSS found when published - --------------------------BEGIN INCLUDED TEXT-------------------- IBM Support Document Information Document number : 7269378 Modified date : More support for: IBM MQ Product : IBM MQ Component : - Software version : 9.1, 9.2, 9.3, 9.4 Operating system(s): Windows AIX Linux Solaris IBM i Security Bulletin Summary Multiple issues were identified with the IBM Runtime Environment, Java Technology Edition which is shipped with IBM MQ Vulnerability Details CVEID: CVE-2026-21945 DESCRIPTION: Java SE is vulnerable to a denial of service, caused by an easily exploitable vulnerability issue that allows an remote attacker to cause a hang or repeatable crash of the application. CWE: CWE-400: Uncontrolled Resource Consumption CVSS Source: secalert_us@oracle.com CVSS Base score: 7.5 CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2026-21932 DESCRIPTION: Java SE could allow a remote attacker to bypass security controls and create, delete, or modify critical data or all accessible data, caused by an easily exploitable vulnerability. CVSS Source: secalert_us@oracle.com CVSS Base score: 7.4 CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N) CVEID: CVE-2026-21933 DESCRIPTION: Java SE could allow a remote attacker to bypass security controls and perform unauthorized update, insert, delete, or read operations on accessible data, caused by an easily exploitable vulnerability. CVSS Source: secalert_us@oracle.com CVSS Base score: 6.1 CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) CVEID: CVE-2026-21925 DESCRIPTION: Java SE could allow a remote unauthenticated attacker to bypass security controls and perform unauthorized update, insert, delete, or read operations on accessible data, caused by an difficult to exploit vulnerability. CVSS Source: secalert_us@oracle.com CVSS Base score: 4.8 CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N) Affected Products and Versions +-------------------+------------------------+ |Affected Product(s)|Version(s) | +-------------------+------------------------+ |IBM MQ |9.1.0.0. to 9.1.0.33 LTS| +-------------------+------------------------+ |IBM MQ |9.2.0.0 to 9.2.0.40 LTS | +-------------------+------------------------+ |IBM MQ |9.3.0.0 to 9.3.0.36 LTS | +-------------------+------------------------+ |IBM MQ |9.3.0.0 to 9.3.5.1 CD | +-------------------+------------------------+ |IBM MQ |9.4.0.0 to 9.4.0.17 LTS | +-------------------+------------------------+ |IBM MQ |9.4.0.0 to 9.4.3.0 CD | +-------------------+------------------------+ The following installable MQ components are affected by the vulnerability: - Java JRE - Managed File Transfer - MQ IPT - IBM MQ Explorer - Telemetry Service - AMQP Service - Rest API and Console - IBM MQ Bridge to Blockchain - IBM MQ Bridge to Salesforce If you are running any of these listed components, please apply the remediation /fixes as described below. For more information on the definitions of components used in this list see https://www.ibm.com/support/pages/ installable-component-names-used-ibm-mq-security-bulletins Remediation/Fixes This issue was addressed under Known Issue DT460995 IBM MQ version 9.1 LTS Apply cumulative security update 9.1.0.34 IBM MQ version 9.2 LTS Apply cumulative security update 9.2.0.41 IBM MQ version 9.3 LTS Apply cumulative security update 9.3.0.37 IBM MQ version 9.4 LTS Apply fix pack 9.4.0.20 IBM MQ version 9.3 CD and 9.4 CD Upgrade to IBM MQ version 9.4.5.0 Workarounds and Mitigations None Change History *The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin. Disclaimer According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions. - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

VendorProductVersions
IBMIBM MQ

Timeline

References

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