# CVE-2026-11906: Denial of service in Db2

> An authenticated user can cause a denial of service in IBM Db2 by exploiting improper neutralization of special elements in XMLTable-derived columns.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **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:** 30 Jun 2026
- **Updated:** 1 Jul 2026
- **Also known as:** GHSA-v7fg-h2r7-7537

## What is CVE-2026-11906?

CVE-2026-11906 is a medium-severity denial of service vulnerability in Ibm Db2, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.4 for Linux, UNIX and Windows (includes Db2 Connect Server) could allow an authenticated user to cause a denial of service due to improper neutralization of special elements in the data query logic of XMLTable-derived columns.

Weakness: CWE-1284 (Improper Validation of Specified Quantity in Input)

## Which versions are affected by CVE-2026-11906?

It affects 1 product.


Products: Ibm Db2.

## How do I fix CVE-2026-11906?

No fix has been published for CVE-2026-11906 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11906 being exploited?

There is no known exploitation of CVE-2026-11906 in the wild and no public exploit code.

## Other vulnerabilities in Ibm Db2

- [CVE-2012-1797](https://insights.sbomify.com/CVE-2012-1797/): IBM DB2 9.5 uses world-writable permissions for nodes.reg, which has unspecified impact and attack vectors. (critical 10.0)
- [CVE-2010-3731](https://insights.sbomify.com/CVE-2010-3731/): Memory corruption in n/a (critical 10.0)
- [CVE-2010-3193](https://insights.sbomify.com/CVE-2010-3193/): Other in n/a (critical 10.0)
- [CVE-2009-4335](https://insights.sbomify.com/CVE-2009-4335/): Other in n/a (critical 10.0)
- [CVE-2009-3473](https://insights.sbomify.com/CVE-2009-3473/): Missing authorization in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11906 and fix it if it is affected.

What it is: CVE-2026-11906 is a medium-severity denial of service vulnerability in Ibm Db2, published on 30 Jun 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-2026-11906 in the wild and no public exploit code.

Affected product: Ibm Db2. 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-2026-11906/ (Markdown: https://insights.sbomify.com/CVE-2026-11906/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11906
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11906
- OSV: https://osv.dev/vulnerability/CVE-2026-11906

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11906/
Summaries are generated and may contain mistakes; the official description above is the record.