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

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.

Published: 2026-06-10 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]

NVD Status：Analyzed，CVE State: published

View at NVD, CVE.org, EUVD

Threat Intelligence & Risk Assessment for CVE-2026-20251

EPSS CVSS CWE GHSA Affected

Conclusion & alert: CVE-2026-20251 is rated Moderate Risk (50.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.56%). Mandatory action: Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-20251

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.37%	0.56%	+0.20%
2	2026-06-11	—	0.37%	—

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20251

CVSS metrics for this CVE.

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]

Weakness enumeration for CVE-2026-20251

CWE-502 MITRE ↗

GitHub Security Advisory for CVE-2026-20251

GHSA-3crw-7xg9-fpxg · Severity: high — In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, Splunk Cloud Platform...

Affected software / configurations for CVE-2026-20251

Vendor	Product	Version	Raw CPE
splunk	splunk	>= 9.3.0, < 9.3.13	cpe:2.3:a:splunk:splunk:::::enterprise:::*
splunk	splunk	>= 9.4.0, < 9.4.12	cpe:2.3:a:splunk:splunk:::::enterprise:::*
splunk	splunk	>= 10.0.0, < 10.0.7	cpe:2.3:a:splunk:splunk:::::enterprise:::*
splunk	splunk	>= 10.2.0, < 10.2.4	cpe:2.3:a:splunk:splunk:::::enterprise:::*
splunk	splunk_cloud_platform	>= 9.3.2411, < 9.3.2411.132	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
splunk	splunk_cloud_platform	>= 10.1.2507, < 10.1.2507.22	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
splunk	splunk_cloud_platform	>= 10.2.2510, < 10.2.2510.14	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
splunk	splunk_cloud_platform	>= 10.3.2512, < 10.3.2512.12	cpe:2.3:a:splunk:splunk_cloud_platform::::::::
splunk	splunk_secure_gateway	>= 3.8.0, < 3.8.67	cpe:2.3:a:splunk:splunk_secure_gateway::::::::
splunk	splunk_secure_gateway	>= 3.9.0, < 3.9.20	cpe:2.3:a:splunk:splunk_secure_gateway::::::::
splunk	splunk_secure_gateway	>= 3.10.0, < 3.10.6	cpe:2.3:a:splunk:splunk_secure_gateway::::::::

References for CVE-2026-20251

URL	Tags
https://advisory.splunk.com/advisories/SVD-2026-0601	Vendor Advisory

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