Input validation error in Splunk Enterprise - CVE-2026-20240
Published: May 21, 2026
Vulnerability identifier: #VU132089
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20240
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Splunk Inc.
Affected software:
Splunk Enterprise
Splunk Enterprise
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in coldToFrozen.sh script in the splunk_archiver app when processing user-supplied file paths. A remote user can supply arbitrary file paths to rename critical Splunk directories to cause a denial of service.
Only users that do not hold the admin or power Splunk roles can exploit this issue, and instances that do not use the Splunk Archiver app are not impacted.
How to mitigate CVE-2026-20240
Install security update from vendor's website.