High severity · published Jun 10, 2026
CVE-2026-20251
Remote Code Execution through Deserialization of Untrusted Data in Splunk Secure Gateway
8.8
CVSS
32.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)32.2% · higher than 98% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SC
Splunk Cloud Platform · Splunk
10.3.2512 before 10.3.2512.12; 10.2.2510 before 10.2.2510.14; 10.1.2507 before 10.1.2507.22; 9.3.2411 before 9.3.2411.132 · source: vendor, NVD
SE
Splunk Enterprise · Splunk
10.2 before 10.2.4; 10.0 before 10.0.7; 9.4 before 9.4.12; 9.3 before 9.3.13 · source: vendor
SS
Splunk Secure Gateway · Splunk
3.10 before 3.10.6; 3.9 before 3.9.20; 3.8 before 3.8.67 · source: vendor, NVD
SP
Splunk · Splunk
9.3.0 before 9.3.13; 9.4.0 before 9.4.12; 10.0.0 before 10.0.7; 10.2.0 before 10.2.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20251
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20251
Vendor Advisory
https://advisory.splunk.com/advisories/SVD-2026-0601
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