# CVE-2026-11828: IBM MQ denial of service in asynchronous message consumption

Source: https://junglewise.ai/threats/cve-2026-11828-ibm-mq-could-allow-a-remote-attacker-with-queue-manager-control  
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-2026-11828 · Severity: medium · CVSS 5.9 · Published 2026-10-19

IBM MQ is a middleware messaging system used to route and queue data between applications. An attacker with control of a queue manager or positioned to intercept unencrypted network traffic can crash client applications that use asynchronous message processing by sending specially crafted queue name values, causing a denial of service that disrupts business communications.

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

## Quick answers

**Is CVE-2026-11828 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11828 being exploited in the wild.

**How severe is CVE-2026-11828?** Medium severity, with a CVSS score of 5.9, published 19 October 2026.

**Which products and versions are affected?** IBM MQ.

**Is there a fix for CVE-2026-11828?** No fixed version is recorded yet. Use encrypted channels (TLS/SSL) for all IBM MQ communications to prevent man-in-the-middle exploitation. Restrict queue manager administrative access to trusted administrators only. 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-2026-11828 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-11828?** 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.

## How to fix


Use encrypted channels (TLS/SSL) for all IBM MQ communications to prevent man-in-the-middle exploitation. Restrict queue manager administrative access to trusted administrators only.

## Technical details

The vulnerability stems from improper validation of queue name length values in IBM MQ's asynchronous message consumption code path. An attacker with queue manager control or man-in-the-middle (MITM) access on unencrypted channels can exploit this by injecting malformed queue name data that triggers a crash in affected client applications. The attack requires either privileged queue manager access or network-level interception capability on unencrypted communication channels.

## 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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