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

> An authenticated attacker can cause a denial of service and leak limited memory layout information via an out-of-bounds read in IBM MQ.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Oct 2026
- **Updated:** 20 Oct 2026
- **Also known as:** GHSA-wvhw-jq53-22mq

## What is CVE-2026-11831?

CVE-2026-11831 is a medium-severity memory corruption vulnerability in IBM MQ Advanced container images, published on 19 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2026-11831?

It affects 2 products.


Products: Ibm Mq Operator, Ibm Supplied Mq Advanced Container Images.

## How do I fix CVE-2026-11831?

No fix has been published for CVE-2026-11831 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11831 being exploited?

There is no known exploitation of CVE-2026-11831 in the wild and no public exploit code.

## Other vulnerabilities in IBM MQ Advanced container images

- [CVE-2026-10572](https://insights.sbomify.com/CVE-2026-10572/): IBM MQ Buffer Overflow (high 8.8)
- [CVE-2026-10574](https://insights.sbomify.com/CVE-2026-10574/): IBM MQ Buffer Overflow (high 8.8)
- [CVE-2026-10743](https://insights.sbomify.com/CVE-2026-10743/): IBM MQ Race Condition (high 8.8)
- [CVE-2026-12665](https://insights.sbomify.com/CVE-2026-12665/): IBM MQ Buffer Overflow (high 8.1)
- [CVE-2024-39742](https://insights.sbomify.com/CVE-2024-39742/): IBM MQ Container authentication bypass (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11831 and fix it if it is affected.

What it is: CVE-2026-11831 is a medium-severity memory corruption vulnerability in IBM MQ Advanced container images, published on 19 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-11831 in the wild and no public exploit code.

Affected product: IBM MQ Advanced container images. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-11831/ (Markdown: https://insights.sbomify.com/CVE-2026-11831/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11831
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11831
- OSV: https://osv.dev/vulnerability/CVE-2026-11831

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11831/
Summaries are generated and may contain mistakes; the official description above is the record.