# CVE-2026-20251: Splunk Secure Gateway unsafe deserialization remote code execution

Source: https://junglewise.ai/threats/cve-2026-20251-splunk-secure-gateway-unsafe-deserialization-remote-code  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-10. Updated: 2026-06-10  
License: CC BY 4.0 with a link back

CVE-2026-20251 · Severity: high · CVSS 8.8 · Published 2026-06-10

Splunk Enterprise and Cloud Platform are data analysis tools used by organizations to monitor and search machine-generated data. A security flaw in the Splunk Secure Gateway component allows a user with low-level access to execute unauthorized commands on the server. This could lead to a complete system takeover, data theft, or disruption of monitoring services.

Technologies: [Splunk Cloud Platform](https://junglewise.ai/threats/technologies/cloud-platform), [Splunk Secure Gateway](https://junglewise.ai/threats/technologies/secure-gateway). Vendors: [Splunk](https://junglewise.ai/threats/vendors/splunk).

## Quick answers

**Is CVE-2026-20251 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20251 being exploited in the wild.

**How severe is CVE-2026-20251?** High severity, with a CVSS score of 8.8, published 10 June 2026.

**Which products and versions are affected?** Splunk Cloud Platform Below 10.3.2512.12, 10.2.2510.14, 10.1.2507.22, 9.3.2411.132; Splunk Secure Gateway Below 3.10.6, 3.9.20, 3.8.67.

**Is there a fix for CVE-2026-20251?** A patch was published on 2026-06-10. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-20251 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-20251?** Check whether you run Splunk Cloud Platform or Splunk Secure Gateway 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

An unsafe deserialization vulnerability exists in the Splunk Secure Gateway app within Splunk Enterprise and Splunk Cloud Platform. The issue stems from the use of the 'jsonpickle' Python library to process App Key Value Store (KV Store) data without sufficient validation. An authenticated, low-privileged attacker can exploit this by providing specially crafted JSON data that, when deserialized, reconstructs arbitrary Python objects. Successful exploitation allows for remote code execution (RCE) on the affected Splunk instance. Patches are available in Splunk Enterprise versions 10.2.4, 10.0.7, 9.4.12, 9.3.13, and higher.

## Affected products

- Splunk Splunk Enterprise Below 10.2.4, 10.0.7, 9.4.12, 9.3.13
- Splunk Splunk Cloud Platform Below 10.3.2512.12, 10.2.2510.14, 10.1.2507.22, 9.3.2411.132
- Splunk Splunk Secure Gateway Below 3.10.6, 3.9.20, 3.8.67

## Timeline

- 2026-06-10: disclosed
- 2026-06-10: advisory
- 2026-06-10: patched

## References

- [https://advisory.splunk.com/advisories/SVD-2026-0601](https://advisory.splunk.com/advisories/SVD-2026-0601)

## Related threats

- [Splunk Enterprise SPL injection in REST API through Secure Gateway](https://junglewise.ai/threats/cve-2026-76295-in-splunk-enterprise-versions-below-10-4-4-10-2-8-10-0-11-and-9-4)
- [Splunk Enterprise missing authorization through REST API endpoints](https://junglewise.ai/threats/cve-2026-76292-in-splunk-enterprise-versions-below-10-4-4-10-2-8-10-0-11-and-9-4)
- [Splunk Enterprise privilege escalation via report notification data](https://junglewise.ai/threats/cve-2026-76351-splunk-enterprise-privilege-escalation-via-report-notification)
- [Splunk Enterprise SSRF in report notifications](https://junglewise.ai/threats/cve-2026-76347-splunk-enterprise-ssrf-in-report-notifications)
- [Splunk Enterprise and Cloud Platform information disclosure in REST API](https://junglewise.ai/threats/cve-2026-20298-splunk-enterprise-and-cloud-platform-information-disclosure-in)