# CVE-2026-6052: IBM Db2 denial of service via memory exhaustion in MDC tables

Source: https://junglewise.ai/threats/cve-2026-6052-ibm-db2-denial-of-service-via-memory-exhaustion-in-mdc-tables  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-27. Updated: 2026-05-27  
License: CC BY 4.0 with a link back

CVE-2026-6052 · Severity: medium · CVSS 6.5 · Published 2026-05-27

IBM Db2 is a widely used database management system for enterprise data storage and analysis. A vulnerability has been identified where certain database queries involving Multi-Clustering-Dimensional (MDC) tables can cause the system to run out of memory. This can lead to a denial-of-service condition, potentially crashing the database and disrupting business operations and application availability.

Technologies: [IBM Db2](https://junglewise.ai/threats/technologies/db2). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-6052 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6052 being exploited in the wild.

**How severe is CVE-2026-6052?** Medium severity, with a CVSS score of 6.5, published 27 May 2026.

**Which products and versions are affected?** IBM Db2 11.5.0 - 11.5.9, 12.1.0 - 12.1.4.

**Is there a fix for CVE-2026-6052?** A patch was published on 2026-05-21: Special builds released for 11.5.9 and 12.1.4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-6052 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-6052?** Check whether you run IBM Db2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

IBM Db2 versions 11.5 (up to 11.5.9) and 12.1 (up to 12.1.4) contain a resource exhaustion vulnerability. The flaw is triggered when the database engine executes specific queries against Multi-Clustering-Dimensional (MDC) tables, leading to excessive memory consumption. An authenticated attacker with network access and the ability to execute queries can exploit this to cause a denial-of-service (DoS) by exhausting available system memory. IBM has released special builds (interim fixes) for versions 11.5.9 and 12.1.4 to address the issue. As a temporary mitigation, users are advised to avoid the use of MDC tables where possible.

## Affected products

- IBM Db2 11.5.0 - 11.5.9, 12.1.0 - 12.1.4

## Timeline

- 2026-05-21: disclosed: Initial publication by IBM
- 2026-05-21: patched: Special builds released for 11.5.9 and 12.1.4
- 2026-05-27: advisory: NVD publication date

## References

- [https://www.ibm.com/support/pages/node/7273557](https://www.ibm.com/support/pages/node/7273557)

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