CVE-2026-12665 IBM MQ Buffer Overflow
Remote attackers can execute arbitrary code via a stack buffer overflow in IBM MQ during TLS certificate processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12665?
CVE-2026-12665 is a high-severity memory corruption vulnerability in IBM MQ Advanced container images, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
IBM MQ could allow a remote attacker to execute arbitrary code due to a stack buffer overflow when processing TLS certificates with malformed distinguished names during channel connection establishment.
Weakness: CWE-121
Which versions are affected by CVE-2026-12665?
It affects 2 products.
Products include Ibm Mq Operator, Ibm Supplied Mq Advanced Container Images.
How do I fix CVE-2026-12665?
No fix has been published for CVE-2026-12665 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-2026-12665 being exploited?
There is no known exploitation of CVE-2026-12665 in the wild and no public exploit code.
Other vulnerabilities in IBM MQ Advanced container images
Sources
Also known as GHSA-2ph8-cjp5-hwrv.