Security: Division-by-zero panic when computing EventHub partition key

[tomaioo]

Summary

Security: Division-by-zero panic when computing EventHub partition key

Problem

Severity: Medium | File: flow/connectors/eventhub/partition_hash.go:L17

HashedPartitionKey performs hash % numPartitions without validating numPartitions. If numPartitions is 0 (from bad config or upstream input), this will panic and can crash the process (DoS).

Solution

Validate numPartitions > 0 before modulo. Prefer changing the function signature to return (string, error) and return a validation error for zero partitions.

Changes

• flow/connectors/eventhub/partition_hash.go (modified)

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[github-actions]

⚠️ Deprecated destination connector

This issue or pull request relates to a deprecated destination connector (Snowflake, BigQuery, ElasticSearch, Kafka, Redpanda, Confluent, Azure Event Hubs, Google Pub/Sub, or S3).

These destinations are no longer actively maintained, but remain functional. We are unlikely to prioritize new work here.

Note: BigQuery is deprecated only as a destination — it remains a supported source.

If you depend on one of these connectors, we recommend:

• Pin to a known-good PeerDB version so behavior stays stable.
• Fork the repository if you need to carry your own changes.

See the deprecated connectors documentation for details and migration guidance.