Executive brief
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.
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