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Back to active CVEs
Medium · CVSS 5.4CVE-2026-11831

IBM MQ Heap-based Buffer OverflowCVE-2026-11831

Answer in brief

CVE-2026-11831 records a Medium severity (CVSS 5.4) vulnerability in IBM MQ Heap-based Buffer Overflow. The current sources do not mark it as known exploited. The current feed maps IBM/MQ Advanced container images (generic), IBM/MQ Operator (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 19, 2026Updated Oct 19, 2026Source checked Oct 19, 2026First seen by HOL Oct 19, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.4
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/MQ Advanced container images (generic), IBM/MQ Operator (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
IBM/MQ Advanced container imagesgeneric>=9.4.0.6-r1 <=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 || 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-r1 || 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 || 9.4.4.1-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-r1 || 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-r2Not reported
IBM/MQ Operatorgeneric>=3.2.0 <=3.2.29 || >=3.3.0 <3.4.0 || 3.4.1 || 3.5.0 || >=3.5.1 <=3.5.3 || >=3.6.0 <=3.6.4 || >=3.7.0 <=3.7.2 || 3.8.0 || 3.8.1 || 3.9.0 || 3.9.1 || 3.9.2 || 4.0.0 || 4.0.1 || 4.0.2 || 4.0.3 || 4.0.4 || >=2.0.0 <=2.0.293.4.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for IBM/MQ Advanced container images, IBM/MQ Operator.
  2. 2Review the reported fix. Source-reported solution: Issues mentioned by this security bulletin are addressed in - * IBM MQ Operator v4.1.0 https://www.ibm.com/docs/en/ibm-mq/10.0.x CD release that included IBM supplied MQ Advanced 10.0.1.0-r1 https://www.ibm.com/docs/en/ibm-mq/10.0.x container image.  * IBM MQ Operator  v4.0.5 https://www.ibm.com/docs/en/ibm-mq/10.0.x SC2 release that included IBM supplied MQ Advanced 10.0.0.5-r2 https://www.ibm.com/docs/en/ibm-mq/10.0.x container image.  * IBM MQ Operator v3.2.30 https://www.ibm.com/docs/en/ibm-mq/9.4.x SC2 release that included IBM supplied MQ Advanced 9.4.0.26-r2 https://www.ibm.com/docs/en/ibm-mq/9.4.x container image. * IBM MQ Container 10.0.1.0-r1 https://www.ibm.com/docs/en/ibm-mq/10.0.x and  10.0.0.5-r2 https://www.ibm.com/docs/en/ibm-mq/10.0.x release. IBM strongly recommends applying the latest container images.  IBM MQ Operator v4.1.0 CD release details: Image Fix Version Registry Image Location ibm-mq-operator v4.1.0 icr.io icr.io/cpopen/ibm-mq-operator@sha256:ed9a217869637c8749270fd485517ea62c8dffbd198a8f7090042ebbeb5bd127 ibm-mqadvanced-server 10.0.1.0-r1 cp.icr.io cp.icr.io/cp/ibm-mqadvanced-server@sha256:06f0892b36e879d0f8957477deeabfe2b4e0fda13f64792edbe7825caf7b77e3 ibm-mqadvanced-server-dev 10.0.1.0-r1 icr.io icr.io/ibm-messaging/ibm-mqadvanced-server-dev@sha256:129d1d736e94bae071039136585734b7ccc6cfd6e1cc7dacb9af59e60d0a57c2 IBM MQ Operator v4.0.5 SC2 release details: Image Fix Version Registry Image Location ibm-mq-operator v4.0.5 icr.io icr.io/cpopen/ibm-mq-operator@sha256:1109597707dfb3fbde274e39698f08a9011f13ca75746a30414e246459571930 ibm-mqadvanced-server 10.0.0.5-r2 cp.icr.io cp.icr.io/cp/ibm-mqadvanced-server@sha256:0218cf9da8c763b502afb02e7c0406654ac64fdd015410d7b73496fbed89a652 ibm-mqadvanced-server-dev 10.0.0.5-r2 icr.io icr.io/ibm-messaging/ibm-mqadvanced-server-dev@sha256:6610f615ac4bf129668b70a9ae288386ea6bee87112056b83792ad2f901bcf9b IBM MQ Operator v3.2.30 SC2 release details: Image Fix Version Registry Image Location ibm-mq-operator v3.2.30 icr.io icr.io/cpopen/ibm-mq-operator@sha256:57dda3eb0391e540ff18029fdcd44a14951a73860bdc7544be5879a8ca49fc40 ibm-mqadvanced-server 9.4.0.26-r2 cp.icr.io cp.icr.io/cp/ibm-mqadvanced-server@sha256:4fc5474a0cd9da504bd4bd26ce5c0b91e088656aa56decb315b450ac7868b7e8 ibm-mqadvanced-server-integration 9.4.0.26-r2 cp.icr.io cp.icr.io/cp/ibm-mqadvanced-server-integration@sha256:a6656d4b9c7db64dd9247c22a00607baf2c9141392d7bf5860a93325604f26ad ibm-mqadvanced-server-dev 9.4.0.26-r2 icr.io icr.io/ibm-messaging/ibm-mqadvanced-server-dev@sha256:abf4c7e931f77aa2aeb340ad054edb35c0f382bf4a7c776d838afab23106b06a IBM MQ Container 10.0.1.0-r1 release details: Image Fix Version Registry Image Location ibm-mqadvanced-server 10.0.1.0-r1 cp.icr.io cp.icr.io/cp/ibm-mqadvanced-server@sha256:06f0892b36e879d0f8957477deeabfe2b4e0fda13f64792edbe7825caf7b77e3 ibm-mqadvanced-server-dev 10.0.1.0-r1 icr.io icr.io/ibm-messaging/ibm-mqadvanced-server-dev@sha256:129d1d736e94bae071039136585734b7ccc6cfd6e1cc7dacb9af59e60d0a57c2 IBM MQ Container 10.0.0.5-r2 release details: Image Fix Version Registry Image Location ibm-mqadvanced-server 10.0.0.5-r2 cp.icr.io cp.icr.io/cp/ibm-mqadvanced-server@sha256:0218cf9da8c763b502afb02e7c0406654ac64fdd015410d7b73496fbed89a652 ibm-mqadvanced-server-dev 10.0.0.5-r2 icr.io icr.io/ibm-messaging/ibm-mqadvanced-server-dev@sha256:6610f615ac4bf129668b70a9ae288386ea6bee87112056b83792ad2f901bcf9b

Evidence timeline and material changes

  1. Published upstream

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 19, 2026

Sources and claim methodology

  • Source referenceibm.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • IBM MQ Buffer OverflowSame ibm/mq advanced container images package
  • IBM MQ Buffer OverflowSame ibm/mq advanced container images package
  • IBM MQ Race ConditionSame ibm/mq advanced container images package
  • IBM MQ Buffer OverflowSame ibm/mq advanced container images package
  • IBM MQ Buffer OverflowSame ibm/mq advanced container images package
  • IBM MQ Deserialization of Untrusted DataSame ibm/mq advanced container images package

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-122
Source
CVE List V5
Source checked
Oct 19, 2026
References
1 linked source
Open source record