CVE-2026-12665: CWE-121 Stack-based Buffer Overflow in IBM MQ Operator
Description
CVE-2026-12665 is a high-severity stack-based buffer overflow vulnerability in IBM MQ Operator. It occurs when processing TLS certificates with malformed distinguished names during channel connection establishment, potentially allowing remote code execution. The vulnerability affects multiple versions of IBM MQ Operator. The CVSS v3.1 score is 8.1, indicating high impact on confidentiality, integrity, and availability.
CVSS v3.1
Score 8.1high
Affected software
IBM
MQ Operator
IBM
MQ Advanced container images
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
IBM MQ Operator contains a stack-based buffer overflow vulnerability (CWE-121) triggered by processing TLS certificates with malformed distinguished names during channel connection establishment. This flaw could allow a remote attacker to execute arbitrary code on the affected system. The vulnerability affects a wide range of IBM MQ Operator versions, including multiple minor and patch releases across several major versions. The CVSS 3.1 base score is 8.1, reflecting network attack vector with high impact on confidentiality, integrity, and availability, and requiring no privileges or user interaction but with high attack complexity.
Potential Impact
Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected IBM MQ Operator instance. This compromises confidentiality, integrity, and availability of the system. The vulnerability arises from improper handling of malformed TLS certificate distinguished names during channel connection establishment, leading to a stack buffer overflow.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict network access to the IBM MQ Operator service to trusted sources and monitor for suspicious activity related to TLS channel connections with malformed certificates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-06-18T19:10:39.497Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad64a152cdf04f6566e6f45
Added to database: 10/19/2026, 16:49:25 UTC
Last enriched: 10/19/2026, 17:03:23 UTC
Last updated: 10/19/2026, 17:08:46 UTC
Views: 3
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