Quick answers
- Is CVE-2026-12665 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-12665 being exploited in the wild.
- How severe is CVE-2026-12665?
- High severity, with a CVSS score of 8.1, published 19 October 2026.
- Which products and versions are affected?
- IBM MQ.
- Is there a fix for CVE-2026-12665?
- 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-2026-12665 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-12665?
- 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 stack buffer overflow occurs in IBM MQ's TLS certificate handling when processing malformed distinguished names during channel connection establishment. The vulnerability is reachable over the network without authentication, allowing an attacker to craft a malicious TLS certificate and trigger code execution on the MQ server or connecting clients.
Affected products
- IBM MQ
Timeline
- 2026-10-19: disclosed