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 ↗

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

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

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