CVE-2026-11728 IBM MQ .NET client is vulnerable to remote code execution
A heap buffer overflow in the IBM MQ .NET client allows remote attackers to execute arbitrary code or cause denial of service via malicious messages.
- 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-2026-11728?
CVE-2026-11728 is a high-severity memory corruption 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 to cause a denial of service or potentially execute arbitrary code in the client due to a heap buffer overflow when receiving messages from a malicious queue manager or through a man-in-the-middle attack.
Weakness: CWE-787
Which versions are affected by CVE-2026-11728?
How do I fix CVE-2026-11728?
No fix has been published for CVE-2026-11728 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-2026-11728 being exploited?
There is no known exploitation of CVE-2026-11728 in the wild and no public exploit code.
Sources
Also known as GHSA-2jc4-fc4x-rj9r.