TI-2026-53455 Aliases CVE-2026-76400 GHSA-hrxg-3jgf-4mh5

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

LOW 27CWE-400Published 2026-08-19 · Updated 2026-08-20

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-400.

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00381 32nd percentileScored 2026-11-07

Fix Fixed Splunk Connect for Kafka (Splunk): 2.2.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Splunk	Splunk Connect for Kafka	2.2 to before 2.2.7	2.2.7	Patch available	CNA

Splunk Connect for Kafka VendorSplunk Affected 2.2 to before 2.2.7 Fixed in 2.2.7 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:splunk:connect_for_kafka::::::::	before 2.2.7	Vulnerable	Splunk

cpe:2.3:a:splunk:connect_for_kafka:*:*:*:*:*:*:*:* Versions before 2.2.7 Vulnerable ·Splunk

Remediation

Fix · CNA Splunk Connect for Kafka (Splunk) Fixed in 2.2.7

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-08-19
Splunk Connect for Kafka 2.2.7
4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-53457 Server-Side Request Forgery (SSRF) through the REST API in Splunk Connect for KafkaPriority MEDIUM 42
- TI-2026-53458 Improper Certificate Validation through HTTP Event Collector Kerberos Authentication in Splunk Connect for KafkaPriority LOW 34
- TI-2026-53456 Regular Expression Denial of Service (DoS) through the REST API in Splunk Connect for KafkaPriority LOW 27
Show all 4 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-76400
2026-10-03 Alias added: GHSA-hrxg-3jgf-4mh5

References

Advisory 1

https://advisory.splunk.com/advisories/SVD-2026-0808

TI-2026-53457 Server-Side Request Forgery (SSRF) through the REST API in Splunk Connect for Kafka CVSS 3.1HIGH 8.2
TI-2026-53458 Improper Certificate Validation through HTTP Event Collector Kerberos Authentication in Splunk Connect for Kafka CVSS 3.1HIGH 7.4
TI-2026-53456 Regular Expression Denial of Service (DoS) through the REST API in Splunk Connect for Kafka CVSS 3.1MEDIUM 5.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences