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CVE-2026-12665: IBM MQ Vulnerability Allows Remote Code Execution

CVE-2026-12665: IBM MQ Vulnerability Allows Remote Code Execution

First seen 19 Oct 2026, 19:51 UTC • •
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ThreatCluster AI
ThreatCluster •October 19, 2026 at 20:51 UTC
  • •CVE-2026-12665 allows remote code execution in IBM MQ due to a stack buffer overflow.
  • •The vulnerability affects queue managers, especially those with broad network access.
  • •No active exploitation has been confirmed, but organizations should expedite remediation.

IBM MQ has a vulnerability (CVE-2026-12665) that could enable remote attackers to execute arbitrary code due to a stack buffer overflow when processing TLS certificates with malformed distinguished names during channel connection establishment. This flaw affects queue managers, particularly those exposed to the internet or partner networks, and could compromise the confidentiality, integrity, and availability of business messaging. Successful exploitation may disrupt transaction flows, alter queued data, or provide attackers with a foothold in the MQ host. The CVSS score for this vulnerability is 8.1, indicating a high severity. Currently, there are no confirmed reports of active exploitation or proof-of-concept code available. IBM has not yet released specific indicators of compromise (IOCs) or exploitation activity. Organizations are advised to prioritize remediation by upgrading to fixed releases and restricting channel exposure.

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Timeline

2026-10-19
CVE-2026-12665 published
IBM disclosed a critical vulnerability in IBM MQ that could allow remote code execution.
Redpacketsecurity

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Common questions

What systems are affected?
IBM MQ queue managers, particularly those exposed to the internet or partner networks.
Is there a patch available?
IBM has released fixed versions, and organizations should upgrade their MQ container images.
What should I do if I can't patch immediately?
Restrict channel exposure and review TLS trust configurations as interim measures.