SB2026061734 - Multiple vulnerabilities in IBM Cloud Pak for Data System
Published: June 17, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Improper Certificate Validation (CVE-ID: CVE-2026-34073)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to bypass certificate name constraints validation.
The vulnerability exists due to improper certificate validation in the X.509 certificate validation logic when validating a peer name against a wildcard SAN certificate chain. A remote attacker can present a crafted certificate chain to bypass certificate name constraints validation.
Exploitation requires an uncommon X.509 topology involving an excluded subtree constraint that matches the peer name.
2) Out-of-bounds read (CVE-ID: CVE-2026-39892)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to out-of-bounds read in Python buffer-accepting APIs when processing a non-contiguous buffer. A local user can pass a specially crafted non-contiguous buffer to cause a denial of service.
The issue can read past the end of the buffer on Python versions later than 3.11.
Remediation
Install update from vendor's website.