Security Bulletin
Summary
IBM App Connect Enterprise Certified Container operator and IntegrationRuntime & IntegrationServer operands are vulnerable to loss of confidentiality (CVE-2026-27137) and denial of service (CVE-2026-27138). This bulletin provides patch information to address the reported vulnerability in Golang module crypto/x509
Vulnerability Details
CVEID: CVE-2026-27138
DESCRIPTION: Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.
CVSS Source: CISA ADP
CVSS Base score: 5.9
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2026-27137
DESCRIPTION: When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.
CVSS Source: CISA ADP
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 App Connect Operator |
CD: 11.4.0 - 11.6.0, 12.1.0 - 12.21.0 12.0 LTS: 12.0.21 - 12.0.22 |
| IBM App Connect Enterprise Certified Containers Operands |
CD: 13.0.6.2-r1 12.0 LTS: 12.0.12-r21 |
Remediation/Fixes
IBM strongly suggests the following:
App Connect Enterprise Certified Container 12.21.0 (Continuous Delivery)
Upgrade to App Connect Enterprise Certified Container Operator version 13.0.0 or higher, and ensure that all IntegrationRuntime components are at 13.0.7.0-r1 or higher. Documentation on the upgrade process is available at https://www.ibm.com/docs/en/app-connect/13.0?topic=releases-upgrading-operator
App Connect Enterprise Certified Container 12.0 LTS (Long Term Support)
Upgrade to App Connect Enterprise Certified Container Operator version 12.0.23 or higher, and ensure that all DesignerAuthoring, IntegrationServer and IntegrationRuntime components are at 12.0.12-r22 or higher. Documentation on the upgrade process is available at https://www.ibm.com/docs/en/app-connect/12.0?topic=umfpr-upgrading-operator-releases
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
07 Apr 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:
01 May 2026
Initial Publish date:
07 April 2026
UID
ibm17268744