IBM MQ 9.3 LTS, 9.3 CD, 9.4 LTS, and 9.4 CD could allow an authenticated user to cause a denial of service due to the improper handling of invalid headers sent to the queue.
The product does not handle or incorrectly handles when a parameter, field, or argument name is specified, but the associated value is missing, i.e. it is empty, blank, or null.