CVE-2019-4656 Denial of service in MQ
An authenticated user can crash the IBM MQ queue by triggering an error processing error messages, requiring a restart.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-4656?
CVE-2019-4656 is a medium-severity denial of service vulnerability in Ibm Mq, published on 16 Mar 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
IBM MQ and IBM MQ Appliance 7.1, 7.5, 8.0, 9.0 LTS, 9.1 LTS, and 9.1 CD is vulnerable to a denial of service attack that would allow an authenticated user to crash the queue and require a restart due to an error processing error messages. IBM X-Force ID: 170967.
Which versions are affected by CVE-2019-4656?
It affects 3 products.
Products include Ibm Mq, Ibm Mq Appliance, Ibm Websphere Mq.
How do I fix CVE-2019-4656?
No fix has been published for CVE-2019-4656 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-4656 being exploited?
There is no known exploitation of CVE-2019-4656 in the wild and no public exploit code.
Other vulnerabilities in Ibm Mq
- CVE-2026-10575 IBM MQ queue manager is vulnerable to remote code execution
- CVE-2026-11375 IBM MQ queue manager is vulnerable to remote code execution
- CVE-2026-11378 IBM MQ queue manager is vulnerable to remote code execution
- CVE-2022-22489 XML external entity in MQ
- CVE-2026-10027 IBM MQ queue manager is vulnerable to unauthenticated remote code execution
Sources
Also known as GHSA-8vcg-h82j-6975.