Deserialization in Splunk
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…
Vulnerability class: Insecure Deserialization
EPSS: 0.190 (97.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Splunk
- Splunk Cloud Platform — versions 10.3.2512, 10.2.2510, 10.1.2507
- Splunk Splunk_cloud_platform
- Splunk Enterprise — versions 10.2, 10.0, 9.4
- Splunk Secure Gateway — versions 3.10, 3.9, 3.8
- Splunk Splunk_secure_gateway
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20251?
- CVE-2026-20251 is a high-severity vulnerability in Splunk, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-06-10.
- How severe is CVE-2026-20251?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-20251 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.