# CVE-2026-20251 — Splunk Enterprise

> As of 2026-06-11, CVE-2026-20251 is a HIGH-severity vulnerability in Splunk Enterprise, CVSS v3.1 8.8, EPSS 32.2% (98.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-20251, most recently “CVE-2026-20251: Splunk Secure Gateway jsonpickle Deserialization RCE with Public PoC”.

**Last updated:** 2026-06-11

## What is CVE-2026-20251?

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.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.

The record classifies CVE-2026-20251 under weakness class [CWE-502](https://intel.threadlinqs.com/cwe/CWE-502). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 122 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 32.2% probability of exploitation in the next 30 days, higher than 98.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-10, last modified 2026-06-11

## Is CVE-2026-20251 being exploited?

Weaponised exploit code for CVE-2026-20251 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 38 in the Threadlinqs vulnerability feed.

- [reactivezero/CVE-2026-20251](https://github.com/reactivezero/CVE-2026-20251) (github)

## Affected products and versions

- [Splunk](https://intel.threadlinqs.com/vendors/splunk): Enterprise, Cloud Platform, Secure Gateway

## How to fix CVE-2026-20251

No vendor patch reference has been recorded for CVE-2026-20251 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-20251

1 tracked threat in the Threadlinqs corpus references CVE-2026-20251, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CVE-2026-20251: Splunk Secure Gateway jsonpickle Deserialization RCE with Public PoC](https://intel.threadlinqs.com/threat/TL-2026-1203) — HIGH · 2026-07-11

## Sources

Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

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

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-20251
Full detection coverage and IOCs for threats exploiting CVE-2026-20251 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp