# CVE-2026-82340: IBM Guardium Data Protection unauthenticated deserialization in CAS listener

Source: https://junglewise.ai/threats/cve-2026-82340-ibm-guardium-data-protection-12-2-is-vulnerable-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-82340 · Severity: critical · CVSS 9.8 · Published 2026-09-18

IBM Guardium Data Protection is an enterprise data security appliance that monitors and protects sensitive databases. A network attacker can send malicious serialized messages to the Change Audit System listener on port 16017 without authentication, causing the appliance to execute arbitrary code and potentially compromise all protected databases.

Technologies: [IBM Guardium Data Protection](https://junglewise.ai/threats/technologies/guardium-data-protection). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-82340 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82340 being exploited in the wild.

**How severe is CVE-2026-82340?** Critical severity, with a CVSS score of 9.8, published 18 September 2026.

**Which products and versions are affected?** IBM Guardium Data Protection 12.2.

**Is there a fix for CVE-2026-82340?** 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-2026-82340 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-82340?** Check whether you run IBM Guardium Data Protection 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 involves unauthenticated insecure deserialization combined with attacker-controlled reflective method dispatch in the CAS listener component. An unauthenticated network attacker can reach TCP port 16017 and submit crafted serialized objects that trigger arbitrary code execution via reflection. No authentication or user interaction is required; the flaw is a direct code injection issue (CWE-94) in the deserialization handler.

## Affected products

- IBM Guardium Data Protection 12.2

## Timeline

- 2026-09-18: disclosed

## References

- [https://www.ibm.com/support/pages/node/7288040](https://www.ibm.com/support/pages/node/7288040)

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