# CVE-2026-11829: IBM MQ denial of service in MQOPEN request handling

Source: https://junglewise.ai/threats/cve-2026-11829-ibm-mq-could-allow-an-authenticated-attacker-to-cause-a-denial-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-19. Updated: 2026-10-19  
License: CC BY 4.0 with a link back

CVE-2026-11829 · Severity: medium · CVSS 6.5 · Published 2026-10-19

IBM MQ is a message queuing middleware used by enterprises to reliably route and process data across applications. An authenticated attacker can crash the MQ server by sending specially crafted MQOPEN requests with invalid offset values, causing service outages and disrupting business-critical messaging operations.

Technologies: [IBM Mq](https://junglewise.ai/threats/technologies/mq). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-11829 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11829 being exploited in the wild.

**How severe is CVE-2026-11829?** 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-2026-11829?** 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-2026-11829 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-11829?** 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

IBM MQ's MQOPEN request handler fails to properly validate offset parameter values, allowing an authenticated attacker to trigger a denial-of-service condition. The vulnerability requires valid MQ credentials but does not require user interaction or special network conditions. Successful exploitation causes the queue manager process to crash, denying service to all connected clients.

## Affected products

- IBM MQ

## Timeline

- 2026-10-19: disclosed

## References

- [https://www.ibm.com/support/pages/node/7292667](https://www.ibm.com/support/pages/node/7292667)

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