--- title: "CVE-2026-11728: IBM MQ - Buffer Overflow" description: "IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 contain a heap buffer overflow caused by improper handling of messages from malicious queue managers or man-in-the-middle attacks, letting remote attackers cause denial of service or execute arbitrary code in the client, exploit requires network access to the client." url: https://panop.io/threat-heartbeat/CVE-2026-11728/ --- # CVE-2026-11728 IBM MQ - Buffer Overflow IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 contain a heap buffer overflow caused by improper handling of messages from malicious queue managers or man-in-the-middle attacks, letting remote attackers cause denial of service or execute arbitrary code in the client, exploit requires network access to the client. CVSS base score 8.1 /10 High CISA KEV Not listed Public exploit None known Authentication Not required EPSS 0.35% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-11728) ## Details Type Buffer Overflow Impact Denial Of Service, Remote Code Execution CVSS vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Published 15 September 2026 Updated 15 October 2026 Weakness [CWE-787](https://cwe.mitre.org/data/definitions/787.html) ## Vendor fix Update to the latest available version of IBM MQ. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-11728](https://nvd.nist.gov/vuln/detail/CVE-2026-11728) - [https://www.ibm.com/support/pages/node/7284943](https://www.ibm.com/support/pages/node/7284943) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)