CVE-2026-11728

Received Received - Intake

Heap Buffer Overflow in IBM MQ Client

Publication date: 2026-09-15

Last updated on: 2026-09-16

Assigner: IBM Corporation

Description

IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 could allow a remote attacker to cause a denial of service or potentially execute arbitrary code in the client due to a heap buffer overflow when receiving messages from a malicious queue manager or through a man-in-the-middle attack.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-09-16

Generated

2026-10-06

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-11728

EUVD

EUVD-2026-78918

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	mq	From 9.1.0.0 (inc) to 9.1.0.37 (inc)
ibm	mq	From 9.2.0.0 (inc) to 9.2.0.43 (inc)
ibm	mq	From 9.3.0.0 (inc) to 9.3.0.41 (inc)
ibm	mq	From 9.3.0.0 (inc) to 9.3.5.1 (inc)
ibm	mq	From 9.4.0.0 (inc) to 9.4.0.25 (inc)
ibm	mq	From 9.4.0.0 (inc) to 9.4.5.1 (inc)
ibm	mq	10.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is a heap buffer overflow in IBM MQ's .NET client's asynchronous message receive handler. It allows a remote attacker to cause a denial of service or execute arbitrary code by exploiting the overflow when receiving messages from a malicious queue manager or via a man-in-the-middle attack.

Detection Guidance

Detection primarily involves checking the installed IBM MQ version and verifying if it falls within the vulnerable range. Use IBM MQ commands like 'dspmqver' to check the version. Monitor network traffic for unusual patterns or malformed messages targeting the .NET client component.

Impact Analysis

If exploited, this vulnerability could lead to system crashes, unauthorized code execution, or disruption of messaging services in applications using affected IBM MQ versions.

Compliance Impact

This vulnerability could lead to unauthorized access or execution of arbitrary code, potentially exposing sensitive data processed by IBM MQ. This may violate compliance requirements under GDPR (data protection) and HIPAA (health information security) by enabling data breaches or unauthorized disclosures.

Mitigation Strategies

Apply cumulative security updates for affected IBM MQ LTS versions or upgrade to IBM MQ version 10.0.0.5 for CD versions. No workarounds or mitigations are currently available.

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