# CVE-2026-16660: IBM Db2 Mirror for i out-of-bounds read denial of service

Source: https://junglewise.ai/threats/cve-2026-16660-ibm-db2-mirror-for-i-out-of-bounds-read-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-04. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-16660 · Severity: medium · CVSS 5.3 · Published 2026-09-04

IBM Db2 Mirror for i is a database mirroring and high-availability solution used by enterprises to protect critical data on IBM i systems. A remote attacker can trigger a denial of service by exploiting an out-of-bounds read vulnerability, causing the database service to crash and become unavailable without requiring authentication or special privileges.

Technologies: [IBM Db2 Mirror For I](https://junglewise.ai/threats/technologies/db2-mirror-for-i). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-16660 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-16660 being exploited in the wild.

**How severe is CVE-2026-16660?** Medium severity, with a CVSS score of 5.3, published 4 September 2026.

**Which products and versions are affected?** IBM Db2 Mirror For I 7.4, 7.5, 7.6.

**Is there a fix for CVE-2026-16660?** A patch was published on 2026-09-01: PTF updates available: 7.4 (SJ11153/SJ11193/SJ11207), 7.5 (SJ11152/SJ11194/SJ11206), 7.6 (SJ11151/SJ11195/SJ11205) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-16660 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-16660?** Check whether you run IBM Db2 Mirror For I 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

The vulnerability is an out-of-bounds read (CWE-125) in IBM Db2 Mirror for i versions 7.4, 7.5, and 7.6. The flaw can be exploited remotely without authentication (AV:N/PR:N) to trigger a denial of service condition. An attacker can craft a malicious network request that causes the application to read memory beyond its allocated bounds, resulting in application crash or service disruption. IBM has released PTF (Program Temporary Fix) updates for all affected versions; patching is the recommended remediation.

## Affected products

- IBM Db2 Mirror for i 7.4, 7.5, 7.6

## Timeline

- 2026-09-04: disclosed
- 2026-09-01: patched: PTF updates available: 7.4 (SJ11153/SJ11193/SJ11207), 7.5 (SJ11152/SJ11194/SJ11206), 7.6 (SJ11151/SJ11195/SJ11205)

## References

- [https://www.ibm.com/support/pages/node/7285904](https://www.ibm.com/support/pages/node/7285904)

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