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4.3

IBM MQ could let logged‑in user crash process

CVE-2026-12727 · published 16 days ago
Summary

IBM MQ and its advanced container images may let someone who is already logged in send a specially crafted object name that triggers an off‑by‑one error, potentially causing the server process to become unstable or stop. This could interrupt messaging services your applications rely on. Apply the latest IBM MQ patches or updates as soon as they are available and restart the service after updating.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
ibm mq operator <= 3.2.29
ibm mq advanced container images 9.4.0.6-r1
Original advisory text
IBM MQ Buffer Overflow
IBM MQ could allow an authenticated attacker to cause potential process instability due to an off-by-one buffer overflow when processing specially crafted object names.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
4.3 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-193Off-by-one Error
Timeline
Published19 Oct 2026
Updated4 Nov 2026
First seen19 Oct 2026
Sources
CVE-2026-12727 · NVD
CVE-2026-12727 · MITRE
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