Resource exhaustion in Splunk Enterprise - CVE-2026-20139
Published: February 19, 2026
Vulnerability identifier: #VU123095
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20139
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources. A remote user that does not hold the “admin” or “power” Splunk roles can craft a malicious payload into the realname, tz, or email parameters of the /splunkd/__raw/services/authentication/users/username REST API endpoint when they change a password and perform a client‑side denial‑of‑service attack.
Affected software
Splunk Enterprise
How to mitigate CVE-2026-20139
Install updates from vendor's website.
Splunk Enterprise - addressed in versions 9.2.12, 9.3.9, 9.4.8, 10.0.2