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5.9

Splunk Connect for Kafka REST API allows malicious regex to crash workers

CVE-2026-76401 · published 2 months ago
Summary

Splunk Connect for Kafka versions below 2.2.7 are affected. An attacker can use the REST API to create a malicious regular expression that can block the delivery of events, causing a denial of service. Update to version 2.2.7 or later to fix this issue.

What to do
  • Update splunk splunk connect for kafka to version 2.2.7 or later.
  • Update splunk connect_for_kafka to version 2.2.7 or later.
Affected software
VendorProductAffected versions
splunk splunk connect for kafka < 2.2.7
splunk connect_for_kafka < 2.2.7
cpe:2.3:a:splunk:connect_for_kafka:*:*:*:*:*:*:*:*
Original advisory text
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 craf...
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.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.9 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-407Inefficient Algorithmic Complexity
Timeline
Published19 Aug 2026
Updated4 Nov 2026
First seen19 Aug 2026
Sources
CVE-2026-76401 · NVD
CVE-2026-76401 · MITRE
CVE-2026-76401 · OSV
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