CVE-2026-12155 IBM MQ Deserialization of Untrusted Data
An authenticated attacker can cause a denial of service in IBM MQ by sending crafted multicast status messages that trigger a null pointer dereference.
- 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-2026-12155?
CVE-2026-12155 is a medium-severity vulnerability in IBM MQ Advanced container images, published on 19 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
IBM MQ could allow an authenticated attacker to cause a denial of service by sending specially crafted multicast status messages that trigger a NULL pointer dereference.
Weakness: CWE-502
Which versions are affected by CVE-2026-12155?
It affects 2 products.
Products include Ibm Mq Operator, Ibm Supplied Mq Advanced Container Images.
How do I fix CVE-2026-12155?
No fix has been published for CVE-2026-12155 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-12155 being exploited?
There is no known exploitation of CVE-2026-12155 in the wild and no public exploit code.
Other vulnerabilities in IBM MQ Advanced container images
Sources
Also known as GHSA-r44r-j5xw-wgw7.