CVE-2026-12727 IBM MQ Buffer Overflow
An authenticated attacker can cause process instability in IBM MQ via an off-by-one buffer overflow when processing crafted object names.
- 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-2026-12727?
CVE-2026-12727 is a medium-severity memory corruption 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 potential process instability due to an off-by-one buffer overflow when processing specially crafted object names.
Weakness: CWE-193
Which versions are affected by CVE-2026-12727?
It affects 2 products.
Products include Ibm Mq Operator, Ibm Supplied Mq Advanced Container Images.
How do I fix CVE-2026-12727?
No fix has been published for CVE-2026-12727 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-12727 being exploited?
There is no known exploitation of CVE-2026-12727 in the wild and no public exploit code.
Other vulnerabilities in IBM MQ Advanced container images
Sources
Also known as GHSA-4g2h-hc9p-x32m.