# CVE-2026-11378: IBM MQ integer overflow in distribution list processing

Source: https://junglewise.ai/threats/cve-2026-11378-ibm-mq-could-allow-an-authenticated-attacker-to-cause-a-denial-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-11378 · Severity: high · CVSS 8.8 · Published 2026-09-18

IBM MQ is a message queue manager used by enterprises to handle message routing and application integration. An authenticated attacker can exploit an integer overflow vulnerability in distribution list processing to write to arbitrary memory locations, leading to denial of service or remote code execution on the affected queue manager.

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

## Quick answers

**Is CVE-2026-11378 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11378 being exploited in the wild.

**How severe is CVE-2026-11378?** High severity, with a CVSS score of 8.8, published 18 September 2026.

**Which products and versions are affected?** IBM Mq 9.1.0.0 to 9.1.0.37 LTS, 9.2.0.0 to 9.2.0.43 LTS, 9.3.0.0 to 9.3.0.41 LTS, 9.3.0.0 to 9.3.5.1 CD, 9.4.0.0 to 9.4.0.25 LTS, 9.4.0.0 to 9.4.5.1 CD, 10.0.0.0.

**Is there a fix for CVE-2026-11378?** 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-2026-11378 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-11378?** Check whether you run IBM Mq at an affected version. 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

An integer overflow in the queue manager's object descriptor conversion allows authenticated attackers to write zeros to arbitrary heap memory locations via distribution list processing. Attack requires network access and prior authentication. Successful exploitation results in remote code execution or denial of service.

## Affected products

- IBM MQ 9.1.0.0 to 9.1.0.37 LTS, 9.2.0.0 to 9.2.0.43 LTS, 9.3.0.0 to 9.3.0.41 LTS, 9.3.0.0 to 9.3.5.1 CD, 9.4.0.0 to 9.4.0.25 LTS, 9.4.0.0 to 9.4.5.1 CD, 10.0.0.0

## Timeline

- 2026-09-14: disclosed

## References

- [https://www.ibm.com/support/pages/node/7284945](https://www.ibm.com/support/pages/node/7284945)

## Related threats

- [IBM MQ integer overflow in malformed MQINQ request](https://junglewise.ai/threats/cve-2026-18142-ibm-mq-9-2-0-0-through-9-2-0-44-lts-9-3-0-0-through-9-3-0-42-lts)
- [IBM MQ password disclosure in log files](https://junglewise.ai/threats/cve-2026-14252-ibm-mq-9-2-0-0-through-9-2-0-44-lts-9-3-0-0-through-9-3-0-42-lts)
- [IBM MQ Managed File Transfer arbitrary code execution via environment variables](https://junglewise.ai/threats/cve-2026-13292-ibm-mq-9-2-0-0-through-9-2-0-44-lts-9-3-0-0-through-9-3-0-42-lts)
- [IBM MQ XML external entity injection in Managed File Transfer](https://junglewise.ai/threats/cve-2026-13289-ibm-mq-9-2-0-0-through-9-2-0-44-lts-9-3-0-0-through-9-3-0-42-lts)
- [IBM MQ XML external entity injection in Managed File Transfer](https://junglewise.ai/threats/cve-2026-13284-ibm-mq-9-2-0-0-through-9-2-0-44-lts-9-3-0-0-through-9-3-0-42-lts)