Security Bulletin
Summary
A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. Vulnerability was addressed in IBM Cloud Pak System version 2.3.6.1.
Vulnerability Details
CVEID: CVE-2025-6021
DESCRIPTION: A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.
CWE: CWE-190: Integer Overflow or Wraparound
CVSS Source: secalert@redhat.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)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM Cloud Pak System | 2.3.4.0 |
| IBM Cloud Pak System |
2.3.4.1 2.3.4.1 IFix1 |
| IBM Cloud Pak System | 2.3.5.0 |
| IBM Cloud Pak System | 2.3.6.0 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerabilities now by upgrading to version 2.3.6.1.
IBM Cloud Pak System provides OS image for Red Hat Enterprise Linux System 4.0.8.0 based on Red Hat Enterprise Linux 8.10 and OS image for Red Hat Enterprise Linux System 5.0.3 based on Red Hat Enterprise Linux 9.6. IBM Cloud Pak System provides IBM WebSphere Application Server Liberty V25.0.0.9; IBM Storage Scale is also upgraded to IBM Storage Scale V5.2.3.3.
For Power, contact IBM Support.
This Security bulletin applies to IBM Cloud Pak System, IBM Cloud Pak System Software, and IBM Cloud Pak System Software Suite.
Information on upgrading here http://www.ibm.com/support/docview.wss?uid=ibm10887959
For unsupported versions the recommendation is to upgrade to a supported version of the product.
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
25 Feb 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.
Document Location
Worldwide
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Document Information
Modified date:
25 February 2026
Initial Publish date:
25 February 2026
UID
ibm17261732