CVE-2026-3676

Vulnerability

IBM Cloud APM Base Private 8.1.4 and Advanced Private 8.1.4, which bundle IBM Db2 for Linux, UNIX, and Windows (including DB2 Connect Server), are vulnerable to a denial of service due to improper neutralization of special elements in the data query logic of the Fenced environment. An authenticated user can exploit this by sending a specially crafted SQL query that triggers resource exhaustion or crashes the database service. The vulnerability is present in the bundled Db2 component and affects the specified versions.

Exploitation

An attacker must have valid authentication credentials to the IBM Cloud APM system. With network access, the attacker can submit a malicious SQL query to the Db2 Fenced environment. The Fenced environment is designed to isolate user-defined functions and stored procedures, but the improper neutralization allows the query to bypass input validation, leading to uncontrolled resource consumption or a crash. No additional user interaction is required beyond the initial authentication.

Impact

Successful exploitation results in a denial of service, rendering the Db2 service unavailable. This impacts the availability of the IBM Cloud APM product, potentially disrupting monitoring and performance management capabilities. The CVSS v3 base score is 6.5 (Medium), with a vector indicating network attack vector, low complexity, required authentication, no user interaction, and high availability impact. Confidentiality and integrity are not affected.

Mitigation

IBM has released a security bulletin [1] that addresses this vulnerability. The recommended mitigation is to apply the latest fixes for the bundled IBM Db2 component as specified in the bulletin. Users should upgrade to the patched versions of IBM Cloud APM Base Private and Advanced Private. No workarounds are documented in the available references. If the product is end-of-life, upgrading to a supported version is advised.