CVE-2026-11831: IBM MQ Heap-based Buffer Overflow

Published Oct 15, 2026
·
Updated

IBM MQ could allow an authenticated attacker to cause a limited denial of service and obtain very limited information about process memory layout due to an out-of-bounds read when processing a specially crafted client request.

Affected Software

2 affected components
IBM MQ Operator<=SC2: v3.2.0 - v3.2.29 CD:  v3.3.0, v3.4.0, v3.4.1, v3.5.0, v3.5.1 - v3.5.3, v3.6.0 - v3.6.4, v3.7.0 - v3.7.2, v3.8.0, v3.8.1, v3.9.0, v3.9.1, v3.9.2, v4.0.0, v4.0.1, v4.0.2, v4.0.3, v4.0.4 LTS: v2.0.0 - 2.0.29
IBM supplied MQ Advanced container images<=SC2: 9.4.0.6-r1, 9.4.0.6-r2, 9.4.0.7-r1, 9.4.0.10-r1, 9.4.0.10-r2, 9.4.0.11-r1, 9.4.0.11-r2, 9.4.0.11-r3, 9.4.0.12-r1, 9.4.0.15-r1 - 9.4.0.15-r4, 9.4.0.16-r1, 9.4.0.16-r2, 9.4.0.17-r1, 9.4.0.17-r2, 9.4.0.20-r1, 9.4.0.21-r1, 9.4.0.21-r2, 9.4.0.25-r1 - 9.4.0.25-r3, 9.4.0.26-r1CD: 9.4.1.0-r1, 9.4.1.0-r2, 9.4.1.1-r1, 9.4.2.0-r1, 9.4.2.0-r2, 9.4.2.1-r1, 9.4.2.1-r2, 9.4.3.0-r1, 9.4.3.0-r2, 9.4.3.1-r1 - 9.4.3.1-r3, 9.4.4.0-r1 - 9.4.4.0-r4, 9.4.4.1-r1, 9.4.5.0-r1, 9.4.5.0-r2, 9.4.5.1-r1, 10.0.0.0-r1 - 10.0.0.0-r4, 10.0.0.5-r1LTS: 9.3.0.0-r1, 9.3.0.0-r2, 9.3.0.0-r3, 9.3.0.1-r1, 9.3.0.1-r2, 9.3.0.1-r3, 9.3.0.1-r4, 9.3.0.3-r1, 9.3.0.4-r1, 9.3.0.4-r2, 9.3.0.5-r1, 9.3.0.5-r2, 9.3.0.5-r3, 9.3.0.6-r1, 9.3.0.10-r1, 9.3.0.10-r2, 9.3.0.11-r1,9.3.0.11-r2, 9.3.0.15-r1, 9.3.0.16-r1, 9.3.0.16-r2, 9.3.0.17-r1, 9.3.0.17-r2, 9.3.0.17-r3, 9.3.0.20-r1, 9.3.0.20-r2, 9.3.0.21-r1, 9.3.0.21-r2, 9.3.0.21-r3, 9.3.0.25-r1, 9.4.0.0-r1, 9.4.0.0-r2, 9.4.0.0-r3, 9.4.0.5-r1, 9.4.0.5-r2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade IBM MQ Container to a version that resolves this vulnerability.

    Fixed in 10.0.0.5-r2
  2. Upgrade

    Upgrade IBM MQ Container to a version that resolves this vulnerability.

    Fixed in 10.0.1.0-r1
  3. Upgrade

    Upgrade IBM MQ Container to a version that resolves this vulnerability.

    Fixed in 9.4.0.26-r2
  4. Upgrade

    Upgrade IBM MQ Operator to a version that resolves this vulnerability.

    Fixed in v3.2.30
  5. Upgrade

    Upgrade IBM MQ Operator to a version that resolves this vulnerability.

    Fixed in v4.0.5
  6. Upgrade

    Upgrade IBM MQ Operator to a version that resolves this vulnerability.

    Fixed in v4.1.0

Event History

Oct 15, 2026
CVE Published
via IBM·12:00 AM
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
Oct 19, 2026
CVE Published
via MITRE·04:41 PM
Data Sourced
via MITRE·04:41 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·05:17 PM
DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

Which deployments should be assessed for exposure?

Assess deployments using IBM MQ Operator or IBM-supplied MQ Advanced container images, as these are the products identified as affected.

2

What does an attacker need to exploit this issue?

An attacker needs authenticated access and must send a specially crafted client request. No user interaction is required.

Company

Resources

Contact

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