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CRE-2025-0025

Kafka broker replication mismatchMedium
Impact: 6/10
Mitigation: 5/10

CRE-2025-0025View on GitHub

Description

When the configured replication factor for a Kafka topic is greater than the actual number of brokers in the cluster, Kafka repeatedly fails to assign partitions and logs replication-related errors. This results in persistent warnings or an `InvalidReplicationFactorException` when the broker tries to create internal or user-defined topics.


Cause

There are not enough brokers to fulfill the specified replication factor, preventing valid partition assignments.


Mitigation

Match or lower the replication factor to the actual broker count, or scale up the Kafka cluster to accommodate the higher replication factor.


References