CVE-2026-76400 Denial of Service (DoS) through the REST API in Splunk Connect for Kafka
An unauthenticated attacker can cause a denial of service in Splunk Connect for Kafka by triggering infinite retries on failed event batches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76400?
CVE-2026-76400 is a medium-severity denial of service vulnerability in Splunk Connect for Kafka, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Splunk Connect for Kafka versions below 2.2.7, an unauthenticated user who can reach the Kafka Connect Representational State Transfer (REST) API and influence responses from a Hypertext Transfer Protocol (HTTP) Event Collector endpoint in Splunk Enterprise could cause the connector to retry failed event batches until event delivery stops. The vulnerability is possible because HTTP Event Collector delivery retry handling uses an unbounded default for failed batches instead of a finite retry limit. For more information see Install Splunk Connect for Kafka (https://help.splunk.com/en/data-management/integrate-data-with-add-ons/splunk-connect-for-kafka/2.2/install/install-splunk-connect-for-kafka), Data ingestion parameters for Splunk Connect for Kafka (https://help.splunk.com/en/data-management/integrate-data-with-add-ons/splunk-connect-for-kafka/2.2/overview/data-ingestion-parameters-for-splunk-connect-for-kafka), and Set up and use HTTP Event Collector with configuration files (https://help.splunk.com/en/splunk-enterprise/get-data-in/get-started-with-getting-data-in/9.4/get-data-with-http-event-collector/set-up-and-use-http-event-collector-with-configuration-files) in the Splunk documentation.
Weakness: CWE-400
Which versions are affected by CVE-2026-76400?
It affects 1 product.
Products include Splunk Connect for Kafka.
How do I fix CVE-2026-76400?
No fix has been published for CVE-2026-76400 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-76400 being exploited?
There is no known exploitation of CVE-2026-76400 in the wild and no public exploit code.
Other vulnerabilities in Splunk Connect for Kafka
- CVE-2026-76402 Server-Side Request Forgery (SSRF) through the REST API in Splunk Connect for Kafka
- CVE-2026-76403 Improper Certificate Validation through HTTP Event Collector Kerberos Authentication in Splunk Connect for Kafka
- CVE-2026-76401 Regular Expression Denial of Service (DoS) through the REST API in Splunk Connect for Kafka
Sources
Also known as GHSA-hrxg-3jgf-4mh5.