Quick answers
- Is CVE-2026-11831 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-11831 being exploited in the wild.
- How severe is CVE-2026-11831?
- Medium severity, with a CVSS score of 5.4, published 19 October 2026.
- Which products and versions are affected?
- IBM MQ.
- Is there a fix for CVE-2026-11831?
- 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-2026-11831 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-11831?
- 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
An out-of-bounds read vulnerability in IBM MQ's client request processing allows an authenticated attacker to read beyond allocated memory boundaries. The vulnerability requires prior authentication and is triggered via a specially crafted network request, enabling information disclosure of process memory layout and causing limited denial of service through application instability.
Affected products
- IBM MQ
Timeline
- 2026-10-19: disclosed