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Release of Canton 3.7.2

Canton 3.7.2 has been released on November 04, 2026.

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Summary

This is a maintenance release that fixes a resource leak on sequencer nodes and updates the base Docker image to address security vulnerabilities. Sequencer node operators should upgrade.

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What’s New

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Minor Improvements

• The canton-participant, canton-mediator, and canton-sequencer Docker images now enable the HTTP readiness endpoint (/health/ready on port 5071) by default.
• The HEALTHCHECK of the canton-participant Docker image now uses the HTTP readiness endpoint (/health/ready on port 5071) instead of the gRPC health service. Readiness is now only reported once database migrations and storage initialization have completed, so after an upgrade with long-running migrations the container stays unhealthy for longer. Tooling that waits for the container to become healthy (e.g., docker compose up --wait or condition: service_healthy) may need longer timeouts.
• Bump base docker image to 1.0.19 to address security vulnerabilities.

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Security and Bug Fixes

• Sequencer node: fixed a resource leak that caused a spike in threads, CPU and memory consumption. The spike affected the node’s ability to keep up with the rest of the synchronizer and required a restart of the node every few days.

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Compatibility

The following Canton protocol versions are supported: Canton has been tested against the following versions of its dependencies: