8.8

CVE-2026-20251: splunk Deserialization of Untrusted Data

CVSS: 8.8v3.1HighAnalyzed
Published 10-06-2026Last modified 11-06-2026
Open JSON

Vulnerability summary

CVE-2026-20251 is a high (CVSS 8.8) Deserialization of Untrusted Data vulnerability in splunk. EPSS estimates a 32.21% chance of exploitation in the next 30 days, higher than 98.3% of scored vulnerabilities.

Overall risk
42/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
32.21%
0%100%
High · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-06-2026
    PublishedVulnerability first disclosed.
  2. 11-06-2026
    Last modifiedVulnerability information updated.

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

32.21%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

0.00 pp

From 32.21% on 20-09-2026

20-09-202620-10-2026
EPSS score
32.21%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Splunk4 products
  • splunk≥ 9.3.0, < 9.3.13 | ≥ 9.4.0, < 9.4.12 | ≥ 10.0.0, < 10.0.7 | ≥ 10.2.0, < 10.2.4
  • splunk_cloud_platform≥ 9.3.2411, < 9.3.2411.132 | ≥ 10.1.2507, < 10.1.2507.22 | ≥ 10.2.2510, < 10.2.2510.14 | ≥ 10.3.2512, < 10.3.2512.12
  • splunk enterprise≥ 10.2, < 10.2.4 | ≥ 10.0, < 10.0.7 | ≥ 9.4, < 9.4.12 | ≥ 9.3, < 9.3.13
  • splunk_secure_gateway≥ 3.10, < 3.10.6 | ≥ 3.9, < 3.9.20 | ≥ 3.8, < 3.8.67 | ≥ 3.8.0, < 3.8.67 | ≥ 3.9.0, < 3.9.20 | ≥ 3.10.0, < 3.10.6

1 vendor · 4 products

References

1 links