Stack Buffer Overflow in IBM MQ due to Malformed TLS Certificate Handling
CVE-2026-12665

8.1HIGH

Key Information:

Vendor

IBM
Status
MQ Operator
MQ Advanced Container Images
Vendor
CVE Published:
19 October 2026

What is CVE-2026-12665?

IBM MQ contains a vulnerability that may enable remote attackers to execute arbitrary code through a stack buffer overflow vulnerability that arises when processing TLS certificates with improperly formatted distinguished names during the establishment of channel connections. Proper security measures and timely patching are essential to mitigate the risks associated with this vulnerability.

Affected Version(s)

MQ Advanced container images 9.4.0.6-r1

MQ Advanced container images 9.4.0.6-r2

MQ Advanced container images 9.4.0.7-r1

References

https://www.ibm.com/support/pages/node/7292667
vendor-advisorypatch

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.