CVE-2026-12150 IBM MQ queue manager is vulnerable to denial of service
A remote attacker with a trusted TLS certificate can cause a denial of service in IBM MQ due to improper validation of nested certificate data.
- 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-2026-12150?
CVE-2026-12150 is a high-severity denial of service vulnerability in IBM MQ, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 could allow a remote attacker with a trusted TLS client certificate to cause a denial of service and potentially affect memory contents due to improper validation of deeply nested certificate data during TLS certificate processing.
Weakness: CWE-121
Which versions are affected by CVE-2026-12150?
How do I fix CVE-2026-12150?
No fix has been published for CVE-2026-12150 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-2026-12150 being exploited?
There is no known exploitation of CVE-2026-12150 in the wild and no public exploit code.
Sources
Also known as GHSA-h2wg-f62r-5r8m.