Regular Expression Denial of Service (DoS) through the REST API in Splunk Connect for Kafka (CVE-2026-76401) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-76401

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

Answer in brief

CVE-2026-76401 records a Unknown severity vulnerability in Regular Expression Denial of Service (DoS) through the REST API in Splunk Connect for Kafka. The current sources do not mark it as known exploited. The current feed maps Splunk/Splunk Connect for Kafka (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 19, 2026Source checked Aug 19, 2026First seen by HOL Aug 19, 2026Material review Aug 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Splunk/Splunk Connect for Kafka (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Splunk/Splunk Connect for Kafkageneric	>=2.2 <2.2.7	2.2.7

Recommended response

Check inventory. Check lockfiles and deployed manifests for Splunk/Splunk Connect for Kafka.
Review the reported fix. Update Splunk/Splunk Connect for Kafka to 2.2.7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 19, 2026

Sources and claim methodology

Source referenceadvisory.splunk.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.