CVE-2025-3631 IBM MQ denial of service

What is CVE-2025-3631?

CVE-2025-3631 is a medium-severity use after free vulnerability in IBM MQ, published on 11 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An IBM MQ 9.3 and 9.4 Client connecting to an MQ Queue Manager can cause a SIGSEGV in the AMQRMPPA channel process terminating it.

Weakness: CWE-416

Which versions are affected by CVE-2025-3631?

It affects 1 product.

Products include Ibm Mq Appliance.

How do I fix CVE-2025-3631?

No fix has been published for CVE-2025-3631 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2025-3631 being exploited?

There is no known exploitation of CVE-2025-3631 in the wild and no public exploit code.

Other vulnerabilities in IBM MQ

• CVE-2025-0975 IBM MQ code execution High 8.8
• CVE-2017-1318 Command injection in MQ Appliance High 8.8
• CVE-2019-4620 Security feature bypass in MQ Appliance High 8.4
• CVE-2021-38967 Code injection in MQ Appliance High 8.2
• CVE-2024-25048 IBM MQ code execution High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mprx-jp8f-rw8w.