Quick answers
- Is CVE-2026-12670 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-12670 being exploited in the wild.
- How severe is CVE-2026-12670?
- Medium severity, with a CVSS score of 5.3, published 19 October 2026.
- Which products and versions are affected?
- IBM MQ.
- Is there a fix for CVE-2026-12670?
- 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-2026-12670 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-12670?
- 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 denial of service vulnerability in IBM MQ's character set conversion logic allows an authenticated attacker to trigger excessive memory operations by sending a specially crafted message. The vulnerability requires prior authentication to the MQ system. A successful exploit prevents the queue manager from processing messages, causing service unavailability.
Affected products
- IBM MQ
Timeline
- 2026-10-19: disclosed