What’s Vulnerable › Vulnerabilities
CVE-2026-76288: Denial of Service (DoS) through Splunk Web Content-Type Header Parsing in Splunk Enterprise
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-21 · updated 2026-10-30
- Weakness: CWE-400
Description
In Splunk Enterprise versions below 10.4.4, 10.2.8, 10.0.11, and 9.4.16, an unauthenticated user could send a single crafted request to the Splunk Web JavaScript logger endpoint and cause Splunk Web to stop responding to requests. Splunk Web remains unavailable until Splunk Enterprise is restarted. The vulnerability is possible because Splunk Web does not limit request-header parsing before processing the request.
Affected products
- Splunk Enterprise: from 9.4.0 before 9.4.16; from 10.0.0 before 10.0.11; from 10.2.0 before 10.2.8; from 10.4.0 before 10.4.4 — fixed in 9.4.16, 10.0.11, 10.2.8, 10.4.4
- Splunk Enterprise: from 10.4 before 10.4.4; from 10.2 before 10.2.8; from 10.0 before 10.0.11; from 9.4 before 9.4.16 — fixed in 10.0.11, 10.2.8, 10.4.4, 9.4.16
How to fix
Upgrade to a fixed version: Splunk Enterprise 9.4.16, 10.0.11, 10.2.8, 10.4.4; Splunk Enterprise 10.0.11, 10.2.8, 10.4.4, 9.4.16. Check the vendor advisory for mitigations.
References
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