# CVE-2026-11375: IBM MQ stack buffer overflow in XA transaction handling

Source: https://junglewise.ai/threats/cve-2026-11375-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-2026-11375 · Severity: high · CVSS 8.8 · Published 2026-09-18

IBM MQ is a message queue manager used by enterprises to reliably transport data between applications. A stack buffer overflow vulnerability in the XA transaction handling could allow an authenticated attacker to execute arbitrary code or crash the queue manager, potentially compromising critical business operations and data.

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

## Quick answers

**Is CVE-2026-11375 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11375 being exploited in the wild.

**How severe is CVE-2026-11375?** High severity, with a CVSS score of 8.8, published 18 September 2026.

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

**Is there a fix for CVE-2026-11375?** A patch was published on 2026-09-14: Patches available: 9.1.0.38, 9.2.0.44, 9.3.0.42, 9.4.0.26, and 10.0.0.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-11375 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-11375?** 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

A stack buffer overflow exists in IBM MQ's queue manager when processing crafted XA (distributed transaction) identifiers. The vulnerability requires authentication and network access, allowing an authenticated attacker to overflow a buffer and potentially achieve remote code execution or denial of service. Patches are available for all affected LTS and CD versions.

## Affected products

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

## Timeline

- 2026-09-14: disclosed
- 2026-09-14: patched: Patches available: 9.1.0.38, 9.2.0.44, 9.3.0.42, 9.4.0.26, and 10.0.0.5

## References

- [https://www.ibm.com/support/pages/node/7284948](https://www.ibm.com/support/pages/node/7284948)

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