Quick answers
- Is CVE-2026-12155 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-12155 being exploited in the wild.
- How severe is CVE-2026-12155?
- Medium severity, with a CVSS score of 6.5, published 19 October 2026.
- Which products and versions are affected?
- IBM MQ.
- Is there a fix for CVE-2026-12155?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-12155 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-12155?
- Check whether you run IBM Mq. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A NULL pointer dereference vulnerability exists in IBM MQ's handling of multicast status messages. The vulnerability requires an authenticated attacker and is triggered by specially crafted messages sent over the network, resulting in a denial of service through application crash.
Affected products
- IBM MQ
Timeline
- 2026-10-19: disclosed