CVE-2026-76401

Regular Expression Denial of Service (DoS) through the REST API in Splunk Connect for Kafka

Published Aug 19, 2026 CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
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 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 (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.

Remediation

Vendor Solution

Upgrade each affected Splunk app or add-on to the applicable fixed version listed in Product Status.


Vendor Workaround

Restrict access to the Kafka Connect Representational State Transfer (REST) API to trusted administrative hosts and networks. Turn off timestamp extraction by setting enable.timestamp.extraction to false in the connector configuration if you do not use timestamp extraction functionality. For more information see [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.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Splunk connect For Kafka
CPEs cpe:2.3:a:splunk:connect_for_kafka:*:*:*:*:*:*:*:*
Vendors & Products Splunk connect For Kafka
Type Values Removed Values Added
First Time appeared Splunk
Splunk splunk Connect For Kafka
Vendors & Products Splunk
Splunk splunk Connect For Kafka
Type Values Removed Values Added
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 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 (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.
Title Regular Expression Denial of Service (DoS) through the REST API in Splunk Connect for Kafka
Weaknesses CWE-407
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cisco
Published
Updated
Aug 20, 2026, 3:26 PM
Reserved
Aug 19, 2026, 12:02 PM
Status
Analyzed
Published
Aug 19, 2026, 10:17 PM
Modified
Aug 24, 2026, 6:58 PM