An IBM MQ Vulnerability was identified with the Jackson library that is used within the IBM MQ Console to provide REST API functionality. The issue was announced on June 22, 2022. The Jackson library is only used in IBM MQ Versions 9.2.4 and above.

The description of the issue is as follows:

FasterXML jackson-databind is vulnerable to a denial of service, caused by an error when using JDK serialization to serialize and deserialize JsonNode values. By sending a specially crafted request, an attacker could exploit this vulnerability to cause a denial of service.

This issue was resolved under APAR IT40453, for IBM MQ Version 9.2.4 CD and IBM MQ Version 9.2.5 CD you must upgrade to Version 9.3.

IBM says there are no workarounds and mitigations, the only solution is to upgrade.

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