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CVE-2026-20251

Remote Code Execution through Deserialization of Untrusted Data in Splunk Secure Gateway

HIGH
8.8
CVSS Score
Published: June 10, 2026 at 05:16 PM UTC
Updated: June 17, 2026 at 10:17 AM UTC
3 products affected across 1 vendorSplunkSplunk Cloud PlatformSplunk Secure Gateway

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Severity
HIGH8.8
Exploit prediction
EPSS 32%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Splunk· Splunk
95%
10.0 ≤ v < 10.0.710.0.0 ≤ v < 10.0.710.2 ≤ v < 10.2.410.2.0 ≤ v < 10.2.49.3 ≤ v < 9.3.139.3.0 ≤ v < 9.3.139.4 ≤ v < 9.4.129.4.0 ≤ v < 9.4.1210.010.29.39.4
Affected range stops below 10.0.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.2.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.4.12, so it looks safe — our inference, not a vendor statement
Splunk Cloud Platform· Splunk
95%
10.1.2507 ≤ v < 10.1.2507.2210.2.2510 ≤ v < 10.2.2510.1410.3.2512 ≤ v < 10.3.2512.129.3.2411 ≤ v < 9.3.2411.13210.1.250710.2.251010.3.25129.3.2411
Affected range stops below 10.1.2507.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.2.2510.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.3.2512.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.2411.132, so it looks safe — our inference, not a vendor statement
Splunk Secure Gateway· Splunk
95%
3.10 ≤ v < 3.10.63.10.0 ≤ v < 3.10.63.8 ≤ v < 3.8.673.8.0 ≤ v < 3.8.673.9 ≤ v < 3.9.203.9.0 ≤ v < 3.9.203.103.83.9
Affected range stops below 3.10.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.8.67, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.9.20, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://advisory.splunk.com/advisories/SVD-2026-0601

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHcisco
Vector?

Quick Info

StatusANALYZED
CWE
CWE-502

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