CVE-2026-12538 PUBLISHED

IBM MQ Appliance is affected by an improper validation vulnerability

Assigner: ibm
Reserved: 17.06.2026 Published: 04.11.2026 Updated: 04.11.2026

IBM MQ 9.4.0.0 to 9.4.0.26, 9.4.1.0 to 9.4.5.3, and 10.0.0.1 to 10.0.0.5 could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to improper validation of message header structure length fields.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
CVSS Score: 5.4

Product Status

Vendor IBM
Product MQ Appliance
Versions
  • affected from 9.4.0.0 to 9.4.0.26 (incl.)
  • affected from 9.4.1.0 to 9.4.5.3 (incl.)
  • affected from 10.0.0.1 to 10.0.0.5 (incl.)

Solutions

This vulnerability is addressed under APAR DT500605.

IBM strongly recommends addressing the vulnerability now.

IBM MQ Appliance version 9.4 LTS Apply IBM MQ Appliance fix pack 9.4.0.30 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.

IBM MQ Appliance version 9.4 CD - M2003 Upgrade to IBM MQ Appliance 10.0.0.6 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.

IBM MQ Appliance version 9.4 CD - M2002 Apply IBM MQ Appliance cumulative security update 9.4.5.4 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.

IBM MQ Appliance version 10 LTS Apply IBM MQ Appliance cumulative security update 10.0.0.6 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.

References

Problem Types

  • CWE-124 Buffer Underwrite ('Buffer Underflow') CWE