Medium [CVE-2026-115644] Authentication bypass via separate admin listener
This medium-severity Red Hat Linux advisory covers CVE-2026-115644 affecting Red Hat build of Debezium 3, Red Hat Fuse 7, streams for Apache Kafka 3.
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Summary
Apache Kafka Connect contains an authentication bypass vulnerability affecting the admin REST API when admin.listeners is configured with a separate listener from the main listeners property.
When operators isolate the admin REST API by explicitly configuring the "admin.listeners" property, REST extensions specified via rest.extension.classes (such as BasicAuthSecurityRestExtension) are not registered or applied to the admin resource configuration.
While the primary REST API listener (configured via listeners) enforces configured authentication and authorization filters, endpoints mounted under the separate admin listener (/admin/loggers) fail to inherit or instantiate these extension filters.
As a result, the admin logger endpoint accepts unauthenticated read and write requests even when security extensions are active on the main listener. Impact: An unauthenticated attacker with network access to the admin listener can: 1.
Read the complete set of logger names and levels, disclosing loaded class names and which security extensions are in use. 2.
Write logger levels, including with scope=cluster which propagates the change to all workers in the Connect cluster. This can be used to suppress logging (setting root to OFF) or generate excessive log output (setting root to TRACE), potentially impacting availability and observability.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 8 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 8 hours ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, remove or comment out the `admin.listeners` property in the Kafka Connect worker configuration file (`connect-distributed.properties` or `connect-standalone.properties`). When `admin.listeners` is unset, administrative endpoints share the primary listener interface and inherit its configured security extensions: ```properties # admin.listeners=http://localhost:8083 ``` Alternatively, restrict network reachability to the administrative listener port using host firewall rules (such as `firewalld`) or network access controls so that only trusted management networks can access it: ```bash firewall-cmd --permanent --zone=internal --add-port=<ADMIN_PORT>/tcp firewall-cmd --reload ``` Caveats: Unsetting the separate administrative listener consolidates administrative endpoints onto the primary listener address and port. Applying worker configuration changes requires restarting Kafka Connect services (`systemctl restart ...`), which will temporarily interrupt connector execution and data processing.
Official advisory · high-confidence parse· fetched 8 hours ago·verify at source
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