ESB-2026.3158

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.3158 A vulnerability in IBM Semeru affects IBM Db2. (Jan 2026 CPU) 1 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Db2 for Linux, UNIX and Windows Publisher: IBM Operating System: Windows AIX Linux Resolution: Patch/Upgrade CVE Names: CVE-2026-21945 CVE-2026-21932 CVE-2026-21933 CVE-2026-21925 CVE-2026-1188 Original Bulletin: https://www.ibm.com/support/pages/node/7268129 Comment: CVSS (Max): None available when published EPSS (Max): None available when published - --------------------------BEGIN INCLUDED TEXT-------------------- IBM Support Document Information Document number : 7268129 Modified date : More support for: Db2 for Linux, UNIX and Windows Product : Db2 for Linux, UNIX and Windows Component : - Software version : 12.1.x Operating system(s): Linux AIX Linux on IBM Z Systems Windows Security Bulletin Summary There is a vulnerability in IBM Semeru Version 21.0.9.0 and earlier used by IBM Db2. These issues were disclosed as part of the IBM Java SDK updates in Jan 2026. Vulnerability Details CVEID: CVE-2026-1188 DESCRIPTION: In the Eclipse OMR port library component since release 0.2.0, an API function to return the textual names of all supported processor features was not accounting for the separator inserted between processor features. If the output buffer supplied to this function was incorrectly sized, failing to account for the separator when determining when a write to the buffer was safe could lead to a buffer overflow. This issue is fixed in Eclipse OMR version 0.8.0. CWE: CWE-131: Incorrect Calculation of Buffer Size CVSS Source: NVD CVSS Base score: 9.8 CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) Affected Products and Versions +-------------------+---------------+-------------------+ |Affected Product(s)|Version(s) |Applicable Editions| +-------------------+---------------+-------------------+ |DB2 |12.1.0 - 12.1.4|Client and Server | +-------------------+---------------+-------------------+ Please note that this impact is only for CVE-2026-1188. Db2 11.5.9, 12.1.3 and 12.1.4 are not impacted by the following Java CVEs disclosed in Jan 2026: CVE-2026-21925 | CVE-2026-21932 | CVE-2026-21933 | CVE-2026-21945. Remediation/Fixes The recommended solution is to apply the appropriate fix for this vulnerability. The fix for this vulnerability is in the latest version of IBM Semeru. Affected IBM Semeru, Java Technology Edition, Version: o 21.0.9.0 and earlier o Earlier releases (7.0, 6, 5.0, 1.4.2, 1.3.1, 1.2.2 etc.) may also be affected, but they are no longer supported. Fixes for applicable vulnerabilities are included in IBM Semeru, Java Technology Edition: o 21.0.10.0 for Db2 12.1.3 and 12.1.4 releases. Customers running any vulnerable fixpack level of an affected Program, V12.1, can download the latest version of IBM Semeru from Fix Central. Instructions for IBM JDK Installation can be found here: http://www.ibm.com/support/docview.wssuid=swg27050993 IBM does not disclose key Db2 functionality nor replication steps for a vulnerability to avoid providing too much information to any potential malicious attacker. IBM does not want to enable a malicious attacker with sufficient knowledge to craft an exploit of the vulnerability. Workarounds and Mitigations None Acknowledgement Change History 31 Mar 2026: Initial Publication *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. 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