# CVE-2026-6053: IBM Db2 denial of service in range partitioned tables

Source: https://junglewise.ai/threats/cve-2026-6053-ibm-db2-denial-of-service-in-range-partitioned-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-2026-6053 · Severity: medium · CVSS 5.5 · Published 2026-05-27

IBM Db2, a widely used enterprise database management system, is vulnerable to a denial of service issue. An authenticated user with local access can execute a specifically crafted database query against range-partitioned tables to crash the system or exhaust its resources. This could lead to unplanned downtime and disruption of business operations relying on the database.

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

## Quick answers

**Is CVE-2026-6053 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6053 being exploited in the wild.

**How severe is CVE-2026-6053?** Medium severity, with a CVSS score of 5.5, 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-2026-6053?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-6053 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-6053?** 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 is vulnerable to a denial of service due to improper resource management (CWE-770) when processing queries against range-partitioned tables. An attacker with local access and low privileges can trigger this vulnerability by executing a specially crafted SQL query. The root cause appears to be related to memory allocation or intra-parallelism processing, as IBM suggests disabling intra-parallelism or increasing application heap memory as potential mitigations. Successful exploitation results in a complete loss of availability for the database service. Fixes are available as special builds for versions 11.5.9 and 12.1.4.

## Affected products

- IBM Db2 11.5.0 - 11.5.9, 12.1.0 - 12.1.4

## Timeline

- 2026-05-21: advisory: Initial publication by IBM
- 2026-05-27: disclosed: NVD publication date

## References

- [https://www.ibm.com/support/pages/node/7273556](https://www.ibm.com/support/pages/node/7273556)

## Related threats

- [IBM Db2 denial of service in Materialized Query Table query processing](https://junglewise.ai/threats/cve-2026-113698-ibm-db2-11-5-0-through-11-5-9-and-12-1-0-through-12-1-5-is)
- [IBM Db2 denial of service in Materialized Query Table](https://junglewise.ai/threats/cve-2026-104332-ibm-db2-11-5-0-through-11-5-9-and-12-1-0-through-12-1-5-is)
- [IBM Db2 local privilege escalation in db2pd utility](https://junglewise.ai/threats/cve-2026-78404-ibm-db2-11-5-0-through-11-5-9-and-12-1-0-through-12-1-5-is)
- [IBM Db2 arbitrary library loading via CREATE WRAPPER](https://junglewise.ai/threats/cve-2026-18166-ibm-db2-11-5-0-through-11-5-9-and-12-1-0-through-12-1-5-for-linux)
- [IBM Db2 denial of service in XML column insertion](https://junglewise.ai/threats/cve-2026-105466-ibm-db2-11-5-0-through-11-5-9-and-12-1-0-through-12-1-5-is)