Medium [CVE-2026-76401] Regular Expression Denial of Service (DoS) through the REST API in Splunk Connect for Kafka
This medium-severity Splunk advisory covers CVE-2026-76401 affecting Splunk Connect for Kafka.
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Summary
In Splunk Connect for Kafka versions below 2.2.7, an unauthenticated user who can reach the Kafka Connect Representational State Transfer (REST) API could configure timestamp extraction with a crafted regular expression and matching event data to block a Kafka Connect worker thread, stopping event delivery for the affected connector.
The vulnerability is possible because timestamp extraction evaluates customer-supplied regular expressions without a time limit. For more information see Install Splunk Connect for Kafka ( ) and Data ingestion parameters for Splunk Connect for Kafka ( ) in the Splunk documentation.
- Splunk Connect for Kafka 2.2 before 2.2.7
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- The vulnerability is possible because timestamp extraction evaluates customer-supplied regular expressions without a time 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) and 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) in the Splunk documentation.
- In Splunk Connect for Kafka versions below 2.2.7, an unauthenticated user who can reach the Kafka Connect Representational State Transfer (REST) API could configure timestamp extraction with a crafted regular expression and matching event data to block a Kafka Connect worker thread, stopping event delivery for the affected connector.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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