# CVE-2026-3676: IBM Cloud APM and Db2 denial of service in Fenced environment

Source: https://junglewise.ai/threats/cve-2026-3676-ibm-cloud-apm-and-db2-denial-of-service-in-fenced-environment  
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-2026-3676 · Severity: medium · CVSS 6.5 · Published 2026-05-27

IBM Cloud Application Performance Management (APM) is vulnerable to a denial of service due to an underlying issue in its bundled database component, IBM Db2. An authenticated user could exploit this flaw to crash the database service or make it unresponsive. This would disrupt the monitoring and management capabilities of the APM platform, potentially leading to operational blind spots during an outage.

Technologies: [IBM Db2 for Linux, UNIX and Windows](https://junglewise.ai/threats/technologies/db2-for-linux-unix-and-windows). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-3676 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-3676 being exploited in the wild.

**How severe is CVE-2026-3676?** Medium severity, with a CVSS score of 6.5, published 27 May 2026.

**Which products and versions are affected?** IBM Cloud APM Advanced Private 8.1.4; IBM Cloud APM Base Private 8.1.4; IBM Db2 for Linux, UNIX and Windows 11.5.0 through 11.5.9, 12.1.0 through 12.1.4.

**Is there a fix for CVE-2026-3676?** 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-2026-3676 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-3676?** Check whether you run IBM Cloud APM Advanced Private, IBM Cloud APM Base Private, IBM Db2 for Linux or UNIX and Windows 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

A denial of service vulnerability exists in the IBM Db2 component bundled with IBM Cloud APM. The flaw is classified as CWE-1284 (Improper Validation of Specified Quantity in Input) and resides within the data query logic of the Db2 Fenced environment. An authenticated attacker with network access can submit specially crafted SQL queries that fail to be properly neutralized, leading to a system crash or resource exhaustion. The vulnerability affects Db2 versions 11.5 and 12.1. Remediation requires updating the underlying Db2 server and applying the 8.1.4.0-IBM-APM-SERVER-IF0004 (or later) patch to the Cloud APM server.

## Affected products

- IBM Cloud APM Base Private 8.1.4
- IBM Cloud APM Advanced Private 8.1.4
- IBM Db2 for Linux, UNIX and Windows 11.5.0 through 11.5.9, 12.1.0 through 12.1.4

## Timeline

- 2026-05-27: advisory: Initial NVD publication and IBM security bulletin release.

## References

- [https://www.ibm.com/support/pages/node/7273649](https://www.ibm.com/support/pages/node/7273649)

## Related threats

- [IBM Db2 information disclosure in monitoring and event tables](https://junglewise.ai/threats/cve-2025-36372-ibm-db2-information-disclosure-in-monitoring-and-event-tables)
- [IBM Db2 authorization bypass in remote object storage upload](https://junglewise.ai/threats/cve-2026-6938-ibm-db2-authorization-bypass-in-remote-object-storage-upload)
- [IBM Db2 sensitive information disclosure in db2diag logs](https://junglewise.ai/threats/cve-2025-13755-ibm-db2-sensitive-information-disclosure-in-db2diag-logs)