Security Bulletin
Summary
IBM Cloud Pak for Data System (CPDS 1.0) uses the Python cryptography package, which is affected by multiple security vulnerabilities. CVE-2026-34073 involves improper certificate validation where DNS name constraints are only validated against SANs within child certificates and not the "peer name" presented during validation. This could allow a peer to validate against a wildcard leaf certificate even when the parent certificate contains an excluded subtree constraint for that specific domain. CVE-2026-39892 affects the handling of non-contiguous buffers passed to APIs that accept Python buffers (such as Hash.update()), which could lead to buffer overflows. These vulnerabilities could allow attackers to bypass certificate validation controls and cause memory corruption, potentially leading to unauthorized access or service disruption.
Vulnerability Details
CVEID: CVE-2026-34073
DESCRIPTION: cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to version 46.0.6, DNS name constraints were only validated against SANs within child certificates, and not the "peer name" presented during each validation. Consequently, cryptography would allow a peer named bar.example.com to validate against a wildcard leaf certificate for *.example.com, even if the leaf's parent certificate (or upwards) contained an excluded subtree constraint for bar.example.com. This issue has been patched in version 46.0.6.
CWE: CWE-295: Improper Certificate Validation
CVSS Source: NVD
CVSS Base score: 5.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2026-39892
DESCRIPTION: cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 45.0.0 to before 46.0.7, if a non-contiguous buffer was passed to APIs which accepted Python buffers (e.g. Hash.update()), this could lead to buffer overflows. This vulnerability is fixed in 46.0.7.
CWE: CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
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) |
| CPDS | 1.0.0.0 - 1.0.10.0 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerability now by upgrading.
| Affected Product(s) | VRMF | Link to Fix Central |
| CPDS | 1.0.10.0-8.10.26.05.SP1 | 1.0.10.0-8.10.26.05.SP1-WS-ICPDS-fp393 |
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
17 Jun 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:
17 June 2026
Initial Publish date:
17 June 2026
UID
ibm17276765